How to Tell if a Chicken Is Sick: 15 Warning Signs Every Keeper Must Know

Veterinary Disclaimer: This guide is for informational purposes only and does not replace professional veterinary advice. Always consult a qualified avian or poultry veterinarian for diagnosis and treatment. I am not a licensed veterinarian.

You open the coop door on a cold morning, and five of your six hens burst out, eager to start the day. But one stays on the roost. She is sitting with her feathers puffed up, eyes half-closed, barely acknowledging you. Something is wrong.

That moment of recognition, the quiet realization that one of your birds is not herself, is something every chicken keeper experiences. And it is one of the most important skills you will ever develop.

Here is the challenge: chickens are prey animals. They are hardwired to hide weakness. According to Walkerville Vet in Australia, most of the time what looks like “sudden death” or a “heart attack” is really the end of a long, slow illness that was hidden from view. By the time a chicken is obviously sick, she may have been fighting that illness for days or even weeks.

I learned this the hard way in 2021, during my second year keeping chickens in the US after years of poultry farming in Nigeria. I lost a seemingly healthy Buff Orpington overnight. No warning, no obvious symptoms the day before. But when I thought back, the clues had been there. She had been slightly less enthusiastic at feeding time for about a week. She had been roosting in a lower spot than usual. Her comb had lost a bit of its vibrant red color. I just had not been looking closely enough.

That experience changed how I approach flock management. Now, I do a quick visual scan every single morning when I open the coop, and a more thorough hands-on check every Saturday. It takes minutes, and it has saved multiple birds in my flock since then.

This guide will teach you exactly what to look for, starting with what a healthy chicken looks and acts like, then moving through every major warning sign, what each symptom might mean, what is actually normal versus genuinely alarming, and when to call a veterinarian. Whether you are keeping chickens in the US, UK, Canada, Australia, or Nigeria, these fundamentals are universal.

What Does a Healthy Chicken Look and Act Like?

Before you can spot illness, you need to know what normal looks like. And “normal” varies between individual birds, breeds, ages, and seasons. What matters most is knowing your specific flock, their personalities, their habits, and their individual quirks, so you can detect when something deviates.

Here is a quick baseline for healthy chicken behavior and appearance:

Behavior: A healthy chicken is busy. She is alert, aware of what the other birds are doing, pecking the ground, scratching in dirt, chasing flockmates away from a tasty bug, and reacting to sounds in her environment. When you open the coop in the morning, healthy hens should eagerly exit, ready to eat and start their day. Any chicken that stays behind on the roost, sits in a dark corner, or shows no interest in coming out deserves immediate and gentle investigation.

Eyes: Clear, bright, fully open, with dark pupils. The third eyelid (nictitating membrane) should not be visible. According to Walkerville Vet, sick birds often look “sleepy” with partially closed or dull eyes.

Comb and Wattles: Should appear plump, waxy in texture, and a vibrant red color appropriate to the breed. Both a very pale comb and a very dark or bluish comb can indicate illness. Some breeds, like Silkies, naturally have darker combs, so breed knowledge matters here.

Feathers: Smooth, clean, and lying flat against the body (outside of molting season). Feathers should have a healthy sheen. A chicken that looks permanently ruffled or puffed up, especially while other birds look normal, is worth investigating.

Weight and Body Condition: You cannot see if a chicken is thin just by looking at her. You have to feel. According to Walkerville Vet, the key is feeling for the “keel,” the hard ridge of the breastbone running down the middle of the chest. In a healthy, non-laying bird, the keel sits almost below the level of the breast muscle. In a laying hen, the keel stands out more, but there should still be a rounded surface to the remaining muscle. If the keel feels sharp and prominent, with no muscle padding on either side, your bird is underweight.

Droppings: Healthy chicken droppings are generally some shade of brown or green, fairly solid, and topped with a white cap of urates (the chicken equivalent of urine). Chickens also produce cecal droppings several times a day, which look quite different: they are softer, stickier, darker (sometimes mustard colored to nearly black), and noticeably smellier. Cecal droppings are completely normal and actually indicate that the digestive tract is working properly. Knowing the difference prevents unnecessary panic.

Egg Production: Healthy, productive hens lay on a relatively predictable schedule. A sudden, unexplained drop in egg production (not related to molting, shortening daylight, age, or breed) can be one of the earliest indicators that something is wrong. For more on this, see our guide on why chickens stop laying eggs.

15 Warning Signs That Your Chicken Is Sick

Now that you have a picture of what healthy looks like, here are the specific symptoms to watch for. I have organized these from the most commonly observed to the more subtle signs that experienced keepers learn to notice over time.

1. Lethargy and Reduced Activity

This is often the very first thing chicken keepers notice. A normally active, curious bird becomes quiet, still, and uninterested in her surroundings. She may sit in one spot for extended periods, stop foraging, and fail to react when you approach or offer treats.

What it could mean: Lethargy is a general symptom that accompanies nearly every chicken illness, from mild issues like dehydration or heat stress to serious conditions like egg peritonitis, Marek’s disease, or internal parasites.

But is it always illness? Not necessarily. Hens that are broody will sit still for hours and may appear lethargic when they are actually just fixated on hatching eggs. Molting hens also become less active as their bodies redirect energy toward growing new feathers. And on very hot days, chickens naturally slow down, seeking shade and reducing activity.

My personal test: I offer a high-value treat like mealworms or fresh watermelon. A healthy but broody hen will usually get off the nest for a choice treat. A chicken that does not respond to her favorite food is likely genuinely unwell.

For a deeper exploration, see our complete guide on why your chicken might be lethargic: 17 causes and how to help.

2. Loss of Appetite or Reduced Eating

Chickens love to eat. A healthy chicken races to the feeder, competes with flockmates for treats, and spends much of her day foraging. When a bird stops eating or shows markedly reduced interest in food, something is wrong.

What it could mean: Internal parasites (worms), crop problems (impacted or sour crop), respiratory infection, egg binding, or systemic illness.

How to investigate: If you suspect reduced eating, offer feed directly to the bird and then check her crop later. If the crop is still empty hours after being offered food, she genuinely is not eating. A hard, firm crop that feels like a tennis ball could indicate impaction. A soft, squishy crop that smells sour suggests sour crop, a yeast infection of the crop.

Understanding crop problems: Sour crop vs. impacted crop. These are two distinct conditions that keepers often confuse. An impacted crop is a mechanical blockage where tough, fibrous material (long grass, straw, or foreign objects) forms a hard mass that will not pass into the digestive tract. It feels hard and solid, like a golf ball or tennis ball, even after the bird has fasted overnight. Sour crop, on the other hand, is a yeast infection (candidiasis or thrush of the crop) that occurs when the crop’s natural environment becomes disrupted, often following antibiotic use, illness, or impaction. The crop feels soft and doughy, and when you hold the bird close, you may detect a distinctly sour, fermented smell coming from her mouth. If you gently press on the crop of a bird with sour crop, you may hear a sloshing or squelching sound. Both conditions require different treatment approaches, so correct identification matters. When in doubt, consult a veterinarian.

Weight loss follows reduced appetite quickly in chickens because their metabolism is so fast. This is why regular weight monitoring, even just picking up each bird weekly and noting whether she feels lighter, is so valuable.

3. Comb and Wattle Color Changes

The comb and wattles are remarkably reliable health indicators because they reflect blood flow and oxygenation in real time.

Pale or white comb: Could indicate anemia from blood-sucking parasites like mites or lice, heavy worm infestation, internal bleeding, heat exhaustion, or infectious coryza. According to experienced keepers and veterinary sources, a pale comb usually signals lack of blood flow or a low blood count.

Purple or blue comb: Can indicate a lack of oxygen reaching the tissues, a condition called cyanosis. Possible causes include respiratory distress, heart problems, pneumonia, fowl cholera, or in a worst-case scenario, highly pathogenic avian influenza (HPAI). According to the Massachusetts Department of Agriculture, HPAI can cause blue combs and wattles as a clinical sign.

Black comb: May indicate frostbite (common in cold climates, especially on breeds with large combs) or fowl pox. See our guide on how to prevent and treat frostbite on chicken combs.

Shriveled or dry comb: A comb that looks dehydrated and has lost its plump, waxy texture can indicate dehydration, nutritional deficiency, or chronic illness.

Important context: Some breeds naturally have darker or differently shaped combs. Silkies, for example, have mulberry-colored (dark purplish) combs that are completely normal for the breed. This is why knowing your breeds matters. Our breed guides for Buff Orpingtons, Wyandottes, and Brahmas include photos of healthy comb appearance for each breed.

4. Respiratory Symptoms: Sneezing, Coughing, Wheezing

Respiratory issues are among the most alarming symptoms because they can indicate highly contagious diseases, and with HPAI still circulating in 2026, any respiratory symptom deserves immediate attention.

What to listen for: Sneezing, coughing, wheezing, gurgling, rattling sounds when breathing, open-mouth breathing (when it is not simply hot outside), and a sound poultry experts describe as a “snick,” a subtle, high-pitched respiratory noise you can hear when sitting quietly with your flock.

Tail bobbing: This is a subtle but important sign that many keepers miss. Watch for a rhythmic up-and-down movement of the tail synchronized with each breath. Tail bobbing indicates the bird is using increased effort to breathe, engaging abdominal muscles that a healthy chicken does not need. This sign often appears before more obvious symptoms like audible wheezing or open-mouth breathing, making it one of the earliest visual clues of respiratory trouble. I first learned to watch for tail bobbing from a Nigerian poultry veterinarian during my early years of farming, and it has helped me catch respiratory issues in my US flock at least twice before they progressed to audible symptoms.

What it could mean: Mycoplasma gallisepticum (chronic respiratory disease), infectious coryza, infectious bronchitis, Newcastle disease, aspergillosis (fungal infection), gapeworm, or HPAI.

According to Manna Pro’s veterinary guide, respiratory illnesses in poultry are very complex. They may be bacterial infections, viruses, or mycoplasma infections, and multiple pathogens can often be present at the same time. This is why a veterinarian’s diagnostic testing is so important for respiratory cases.

What I do: If I hear respiratory sounds in my flock or observe tail bobbing, the affected bird gets isolated immediately, and I contact my veterinarian that same day. Respiratory diseases spread fast, and early isolation is your best chance of protecting the rest of the flock. See our guide on how to treat chicken respiratory infections and learn to recognize when your chicken is sneezing.

5. Abnormal Droppings

Chicken droppings are one of the most accessible and informative health indicators available to backyard keepers. You do not need to handle the bird, and you see droppings every single day. Learning to read them is like learning a new language.

Normal droppings are brown to green, fairly solid, and topped with a white urate cap. Color varies based on diet. Chickens that eat a lot of greens will produce greener droppings. Dark berries create dark or black droppings. This is normal.

Warning signs in droppings:

• Blood in droppings: This is the one color that should always alarm you. Bloody or reddish droppings can indicate coccidiosis, a serious parasitic infection of the intestines that requires prompt treatment of the entire flock. Kathy Shea Mormino of The Chicken Chick notes that blood found in droppings is not normal and should be investigated.
• Watery, bright green droppings (without green food intake): Can indicate liver problems, Marek’s disease, avian influenza, or severe internal parasites.
• White, chalky diarrhea: May indicate kidney dysfunction, pullorum disease, or severe dehydration.
• Yellow, foamy droppings: Could signal coccidiosis, internal parasites, bacterial or viral infection, or kidney problems.
• Visible worms: If you see actual worms in droppings, your bird has a significant worm burden that requires immediate treatment. Our guide on treating internal parasites and worms in chickens covers treatment protocols.

A practical tip from my flock management: I use a droppings board (a removable tray or board) under the roosts in my coop. Each morning, I glance at the overnight deposits before scraping them off. This gives me a daily snapshot of my flock’s digestive health without any extra effort. Any unusual droppings get investigated. See our full guide on chicken diarrhea and health problems.

6. Decreased or Abnormal Egg Production

For laying hens, egg production is one of the most sensitive health indicators. According to research from the University of Florida IFAS Extension, many factors affect egg laying, including age, molt, weather, stress, nutrition, and disease. But a sudden, unexplained drop is always worth investigating.

What to watch for:

• A normally reliable layer suddenly stops producing
• Thin, weak, or shell-less eggs (can indicate calcium deficiency, infectious bronchitis, or egg drop syndrome)
• Wrinkled, misshapen, or rough-shelled eggs
• Soft or rubbery eggs

If your hen is producing eggs without shells, that can indicate calcium deficiency or a more serious reproductive issue. Our guide on calcium for chickens covers supplementation.

When it is NOT illness: Molting hens naturally stop laying during their annual molt. Production also drops in winter as daylight hours decrease, and older hens (3+ years) gradually produce fewer eggs. These are all normal.

7. Eye Problems

A chicken’s eyes should be clear, bright, round, and fully open.

Abnormal signs include:

• Swollen, puffy, or closed eyes
• Bubbly, foamy, or watery discharge
• Cloudy or discolored iris (can indicate Marek’s disease, where the iris turns gray and the pupil becomes irregular)
• Crusty buildup around the eyes
• One or both eyes stuck shut

What it could mean: Mycoplasma infection, infectious coryza (which often causes facial swelling around the eyes), ammonia burns from poor coop ventilation, eye worm (Oxyspirura mansoni), or Marek’s disease.

Coop ventilation connection: Poor ventilation is one of the most common causes of eye irritation in chickens. Ammonia from droppings builds up in a poorly ventilated coop and literally burns the sensitive mucous membranes of the eyes and respiratory tract. If multiple birds are showing eye irritation, check your ventilation immediately. See our guide on how much ventilation a chicken coop needs.

8. Nasal Discharge

Healthy chickens have dry nostrils. Any visible discharge from the nares (nostrils) is abnormal and warrants investigation.

What to look for: Clear, watery discharge (may indicate a mild upper respiratory irritation or early infection), thick, cloudy, or colored discharge (indicates active infection), and a foul smell from the nasal area (particularly associated with infectious coryza, which produces a characteristically awful odor).

A useful physical check described by OverEZ Chicken Coop: gently hold your chicken’s beak closed and listen to her breathing. It should sound like dry puffs of air without any wheezing, whistling, or gurgling.

Feather clue: According to OverEZ Chicken Coop, if the feathers on a chicken’s shoulders look matted or stained, it could mean she has a sinus infection. Chickens wipe nasal discharge on their shoulder feathers, leaving telltale marks you can spot during a visual inspection without even picking the bird up.

9. Changes in Walking or Standing

Healthy chickens walk with a steady, purposeful gait. Any deviation is worth noting.

What to watch for:

• Limping or favoring one leg
• Reluctance to walk or stand
• Staggering or unsteady gait
• Inability to stand at all
• Standing on one foot for extended periods

What it could mean: Bumblefoot (a bacterial infection of the footpad), leg injuries or fractures, scaly leg mites, Marek’s disease (which can cause progressive paralysis starting in the legs), gout, or nutritional deficiencies. Check our detailed guide on how to spot and treat bumblefoot and our resource on mites and lice on chickens.

My experience: In my flock, mobility changes have most commonly been caused by bumblefoot (three times across six years) and once by scaly leg mites. In both cases, early detection during my weekly foot checks meant the problems were caught and treated before they became serious. Pick up each bird periodically and examine the bottoms of their feet. Look for dark scabs, swelling, redness, or heat.

10. Isolation From the Flock

Chickens are social animals. A chicken that separates herself from the group, staying in a corner, hiding behind objects, or remaining inside the coop while others are out, is often telling you something is wrong.

Why this happens: Sick chickens instinctively isolate for two reasons. First, they are conserving energy to fight illness. Second, they are avoiding the attention of flockmates who may sense weakness and begin bullying or pecking at them.

But is it always illness? A broody hen will also isolate on a nest. You can test this by gently removing her from the nest. A broody hen will eat, drink, and behave normally (though perhaps irritably) before rushing back to the nest. A genuinely sick hen will remain listless and uninterested in food even when removed from her hiding spot.

11. Fluffed-Up Feathers (Puffed Appearance)

A chicken sitting with her feathers puffed out, head tucked in, and body rounded into a ball shape, is one of the classic visual indicators of illness. This posture helps the bird conserve body heat, which she does because her body temperature regulation is being compromised by illness.

The “penguin stance”: Some sick chickens adopt a distinctive upright posture with their tail pointing down, almost like a penguin. This can indicate abdominal discomfort, fluid accumulation in the abdomen (ascites), or egg peritonitis.

Walkerville Vet identifies egg peritonitis as one of the leading causes of death in backyard poultry. The only early clues are loss of body condition, irregular egg production, and a swollen abdomen.

12. Abnormal Feather Loss

Chickens molt once a year, typically in fall, losing and regrowing feathers over a 4 to 12 week period depending on the breed. This is normal and expected.

When feather loss is NOT normal:

• Loss outside of normal molting season
• Asymmetrical loss (one side but not the other, which can indicate feather picking by flockmates or self-plucking)
• Bare patches with visible skin irritation, redness, or scabs
• Feathers that look chewed or broken rather than cleanly molted

What it could mean: External parasites (mites, lice), feather picking from bullying within the flock, nutritional deficiency (particularly protein deficiency), stress, or skin infections.

Red mites vs. scaly leg mites: These are two different parasites that affect chickens differently, and it is important to distinguish between them. Red mites (Dermanyssus gallinae) are blood-sucking parasites that hide in coop crevices during the day and feed on chickens at night. They cause anemia, pale combs, restlessness at night, and feather loss. You may not see them on the bird during the day, but you will find tiny grey or red specks (depending on whether they have recently fed) in cracks and joints of the coop structure, particularly along roost bars. Scaly leg mites (Knemidocoptes mutans), on the other hand, burrow under the scales on a chicken’s legs and feet. They cause the scales to lift, thicken, and develop a crusty, rough appearance. The leg may look white or grey and lumpy rather than smooth. Scaly leg mites stay on the bird permanently rather than hiding in the coop. Treatment approaches differ: red mites require treating the coop environment as well as the birds, while scaly leg mites require direct treatment of the affected legs, typically by smothering the mites with petroleum jelly, surgical spirit, or a specialized treatment like Ivermectin prescribed by a vet. For more on the natural process of feather loss, see our guide on chicken molting season.

13. Swollen Abdomen

A chicken’s abdomen should conform to the shape of her body. It should not bulge outward, feel hard when it should be soft, or have a fluid-filled, balloon-like feeling.

How to check: Gently pick up the bird and feel her abdomen. Egg-laying hens should have a soft, pliable abdomen. Non-laying hens, roosters, and pullets should have firmer abdomens. If a chicken’s abdomen feels round and hard, or if it feels like it is filled with liquid, this indicates a problem.

What it could mean: Egg peritonitis or egg yolk peritonitis (one of the most serious reproductive conditions in hens), ascites (fluid accumulation, sometimes called “water belly”), internal tumors (including reproductive cancers, which are unfortunately common in older laying hens), or egg binding (a hen that cannot pass an egg).

For more on egg peritonitis specifically, see our guide on egg yolk peritonitis treatment.

14. Skin and Leg Abnormalities

During your regular health checks, examine the skin visible on the legs, feet, comb, wattles, and around the vent.

What to watch for:

• Raised, crusty scales on the legs (scaly leg mites)
• Dark scabs or swelling on the footpads (bumblefoot)
• Wart-like growths on the comb, wattles, or unfeathered skin (fowl pox)
• Red, irritated skin visible through missing feathers
• Fecal matting around the vent area (can indicate diarrhea or reproductive problems)
• White, cheesy plaques inside the mouth or on the tongue (oral thrush or candidiasis, which often accompanies sour crop)

15. Unusual Sounds or Vocalizations

Get to know the normal sounds your flock makes. Healthy chickens have a surprisingly diverse vocabulary: contentment purrs, alert calls, egg songs, and conversational clucking. What you are listening for are sounds that do not belong.

Abnormal sounds include: Persistent sneezing, coughing or snicking (a subtle, almost clicking respiratory sound), gurgling or rattling breathing, high-pitched wheezing, and distressed vocalizations that differ from normal alarm calls.

Gaping and head shaking: A chicken that repeatedly stretches her neck upward, opens her beak wide (gaping), and shakes her head as if trying to dislodge something may be infested with gapeworm (Syngamus trachea). Gapeworm is a parasitic roundworm that lodges in the trachea (windpipe), partially blocking the airway. According to multiple poultry health resources, gapeworm symptoms include gaping, coughing, open-mouthed breathing or panting, gasping for breath, and wheezing or hissing sounds. The worms are Y-shaped (male and female are permanently attached), and in severe infestations, they can cause suffocation. Gapeworm is more common in birds that have access to soil where earthworms, slugs, and snails act as intermediate hosts. Treatment typically involves a licensed wormer such as Flubenvet (flubendazole), which is widely available in the UK and Australia, or fenbendazole-based products like Safe-Guard available in the US. Always consult a veterinarian for proper dosing and product selection, as treatment options and regulations vary by country. For a deeper look at internal parasites, see our guide on treating worms in chickens.

According to the University of Kentucky’s poultry extension, it can be beneficial to sit quietly in or near the coop and listen. Once the flock settles, birds that are only mildly ill may reveal themselves through subtle abnormal respiratory sounds that you would miss during a quick, noisy walkthrough.

Other Conditions Worth Knowing About

Beyond the 15 warning signs above, there are a few additional conditions that every chicken keeper should be aware of, especially those that can be prevented through good coop management.

Aspergillosis (Brooder Pneumonia)

Aspergillosis is a fungal respiratory infection caused by Aspergillus fumigatus spores, which grow in moldy bedding, feed, litter, and damp organic material. Unlike bacterial respiratory infections, aspergillosis is not contagious from bird to bird. Chickens become infected by inhaling spores from their environment.

Symptoms include wheezing, rapid or labored breathing, lethargy, increased thirst, loss of appetite, and gasping. Young chicks are particularly vulnerable (hence the common name “brooder pneumonia”), especially when raised on damp, poorly ventilated bedding.

The difficult reality: Unfortunately, there is no reliable cure for aspergillosis in chickens. Antifungal medications exist, but treatment outcomes in poultry are generally poor, and affected birds often need to be humanely euthanized if the infection is advanced. This makes prevention absolutely critical: keep bedding clean and dry, ensure good coop ventilation, never use visibly moldy bedding or feed, and store feed in sealed containers away from moisture. See our guide on where to store chicken feed for proper storage practices.

In my own experience, I have never had an aspergillosis case in my flock, and I attribute that directly to the deep litter management practices I follow. The deep litter method, when done correctly with regular dry material additions and proper ventilation, actually promotes beneficial microorganisms that compete with harmful molds. The key word there is “correctly.” A neglected deep litter system that becomes soggy and compacted creates exactly the conditions aspergillosis thrives in.

Fowl Cholera

Fowl cholera is a serious bacterial disease caused by Pasteurella multocida that can cause sudden death in otherwise healthy-looking birds. According to the Merck Veterinary Manual, acute fowl cholera can kill birds within hours with few or no prior symptoms. When symptoms are present, they include lethargy, ruffled feathers, mucous discharge from the mouth, greenish-yellow diarrhea, labored breathing, and a darkened or cyanotic (bluish-purple) comb and wattles.

Fowl cholera is more common in mature flocks (over 16 weeks) and tends to appear during periods of stress or weather change. It can spread through contact with infected birds, contaminated water, or from wild birds and rodents that carry the bacteria. Treatment requires veterinary-prescribed antibiotics, typically sulfonamides or tetracyclines, though even with treatment, mortality can be high.

Mushy Chick Disease (Omphalitis)

If you are raising chicks from hatch, be aware of omphalitis, commonly called “mushy chick disease.” This bacterial infection occurs when the navel of a newly hatched chick fails to close properly, allowing bacteria to enter the abdominal cavity. Affected chicks appear weak, lethargic, and may have a swollen, soft, and foul-smelling abdomen. The navel area may look red, inflamed, or wet.

Mushy chick disease is most commonly caused by unsanitary incubation conditions, including contaminated incubators, dirty hatching environments, or excessively high humidity during hatch. There is often no effective treatment for severely affected chicks, and mortality is high. Prevention centers on maintaining a clean incubator, proper humidity levels, and good hygiene during the hatching process. For more on raising young chicks safely, see our guide on bringing chicks home: 15 must-haves and how to treat pasty butt in chicks.

Sick vs. Normal: Common Situations That Mimic Illness

One of the biggest challenges for chicken keepers, especially beginners, is distinguishing between illness and normal chicken behavior that looks alarming. Here are the most common false alarms:

Molting vs. Illness

During their annual molt, chickens can look absolutely terrible. They lose feathers (sometimes in dramatic patches), their comb may pale, they stop laying, they become less active, and they may eat less enthusiastically. All of this is normal during a molt. The key differentiator is that a molting chicken still eats, drinks, and behaves relatively normally. She looks rough, but she is not hiding, not lethargic, and not showing respiratory symptoms. See our full guide on chicken molting season for what to expect.

Broodiness vs. Illness

A broody hen sits on the nest all day, barely moves, puffs up when you approach, growls at you, and eats very little. She can look extremely sick. The test is simple: remove her from the nest. A broody hen will eat, drink, produce an enormous and spectacularly smelly “broody poop,” and then rush back to the nest. A sick hen will remain listless. For tips on managing broodiness, see our guide on how to break a broody hen.

Heat Stress vs. Respiratory Illness

On hot days, chickens pant with open beaks, hold their wings away from their bodies, become less active, and may have watery droppings from increased water intake. This looks alarming but is simply the chicken’s cooling mechanism. If the behavior resolves when temperatures drop or when shade and water are provided, it is heat stress, not illness. If open-mouth breathing persists in moderate temperatures, investigate further. For hot climate strategies, see what to feed chickens during a heatwave.

Dustbathing vs. Seizures

A chicken enthusiastically dustbathing can look like she is having a seizure, lying on her side, kicking, flapping, and rolling in the dirt. If she hops up, shakes herself off, and walks away normally, she was just enjoying a bath. For more on this essential behavior, see our guide on how to set up a dust bath for chickens.

The 60-Second Morning Health Check

Every morning when I open the coop, I run through this quick mental checklist. It takes less than a minute and has caught problems before they became emergencies.

1. Count heads. Is everyone present and accounted for?
2. Watch the exit. Do all birds exit eagerly? Anyone staying behind?
3. Scan for posture. Any bird sitting puffed up, hunched, or in an unusual position?
4. Listen. Any sneezing, coughing, snicking, or abnormal breathing sounds?
5. Watch the tails. Any bird showing rhythmic tail bobbing while breathing?
6. Glance at the droppings board. Any blood, unusual color, or extremely watery deposits?
7. Observe at the feeder. Is every bird eating? Anyone standing near food but not eating?
8. Watch them walk. Any limping, staggering, or reluctance to move?

If everything checks out, you are good. If anything seems off, investigate further with a hands-on examination.

The Weekly Hands-On Health Check

Once a week (I do mine every Saturday), pick up each bird individually for a brief physical examination. This is your chance to catch things that a visual scan alone will miss.

Head and face: Check eyes for clarity and discharge. Check nostrils for dryness. Examine the comb and wattles for color, texture, and any growths or lesions. Look at the ears (located just behind the eyes) for any discharge or swelling. Open the beak and glance inside for any white plaques or unusual growths that could indicate thrush or canker.

Crop: Feel the crop first thing in the morning before the bird has eaten. It should be empty or nearly empty. A crop that is still full, hard, or squishy and sour-smelling from the night before indicates a crop problem.

Body condition: Feel the keel bone. Assess whether muscle mass seems adequate or whether the bird is losing weight.

Abdomen: Gently palpate. Note any swelling, hardness, or fluid feeling.

Vent area: Check for fecal matting, redness, swelling, or signs of external parasites.

Feet and legs: Examine the bottoms of both feet for any dark scabs, swelling, or heat (bumblefoot). Check the legs for raised or crusty scales (scaly leg mites). Trim overgrown nails if needed.

Feathers and skin: Part the feathers and look at the skin beneath, especially around the vent, under the wings, and at the base of the tail. Look for lice (small, fast-moving straw-colored insects that cluster near the vent and under wings), red mite evidence (tiny grey or red specks, particularly around the vent), and any skin irritation.

For a complete examination protocol, see our detailed chicken health check guide.

What to Do When You Find a Sick Chicken: First Response Steps

You have identified a problem. Now what? Here is the protocol I follow, refined over six years and dozens of situations:

Step 1: Isolate the Bird

Separate the sick chicken from the rest of the flock immediately. This serves two purposes: it prevents potential disease transmission to other birds, and it protects the sick bird from being bullied by flockmates who sense weakness. Use a clean, warm, quiet space like a large dog crate, a separate small enclosure, or a bathroom/garage setup with bedding.

Step 2: Provide Water and Basic Nutrition

Dehydration kills sick chickens faster than most diseases. According to Freedom Ranger Hatchery, ensuring your ill bird has plenty of fresh, clean water is critical because chickens need water to regulate their metabolism, digest food, and eliminate waste. If the bird is not drinking on her own, use a medicine dropper or syringe to gently offer small amounts of water.

Adding a poultry electrolyte supplement to the water for the first few days helps with rehydration. You can also offer a warm mash of their regular feed mixed with water to encourage eating.

Important caution: If your bird is eating and drinking normally, do not add supplements, apple cider vinegar, garlic, or other additives they are not used to. Introducing unfamiliar foods to a sick bird can shock their system and worsen their condition.

Step 3: Observe and Document

Before rushing to treat, spend some time watching the isolated bird and recording what you see. Note:

• Which specific symptoms are present?
• When did you first notice them?
• Is the bird eating and drinking?
• What do the droppings look like?
• Is the bird still producing eggs?
• Have any other birds in the flock shown similar symptoms?

This information is invaluable if you need to consult a veterinarian, whether in person or by phone.

Step 4: Check the Rest of the Flock

If one bird is sick, examine every other bird in the flock for similar symptoms. If multiple birds are affected, this suggests an infectious or environmental cause rather than an individual health problem. If only one bird is affected, the cause is more likely to be individual (injury, reproductive issue, or chronic condition).

Step 5: Assess Severity and Decide on Next Steps

For mild symptoms (slightly reduced appetite, minor comb paleness, a day of lethargy), monitoring closely for 24 to 48 hours while providing supportive care (warmth, hydration, quiet rest) is reasonable.

For moderate to severe symptoms (respiratory distress, bloody droppings, inability to stand, significant swelling, multiple birds affected), contact a veterinarian promptly.

When You Must Call a Veterinarian Immediately

Certain situations require professional help without delay. Contact an avian veterinarian, your state veterinarian, or the USDA Veterinary Services office (toll-free at 1-866-536-7593) if you observe:

• Sudden death of one or more birds without prior symptoms
• Multiple birds becoming sick at the same time, especially with respiratory symptoms
• Severe respiratory distress (gasping, open-mouth breathing in cool weather, persistent tail bobbing)
• Neurological symptoms (twisted neck, tremors, paralysis, walking in circles)
• Rapid decline in a previously healthy bird
• Purple or blue discoloration of the comb and wattles combined with other symptoms
• No improvement after 48 hours of supportive care for milder symptoms

According to USDA APHIS, HPAI can cause sudden death without any prior symptoms of illness, as well as respiratory distress, lack of energy, decreased egg production, and diarrhea. The heads and legs may have purple discoloration. There is no treatment for HPAI. The only way to stop the disease is to depopulate all affected and exposed poultry. If you suspect avian influenza, report it immediately.

For help finding a qualified avian vet, see our guide on when to call the vet for a backyard chicken.

Avian Influenza in 2026: What Every Backyard Keeper Needs to Know

With HPAI continuing to circulate in wild bird populations and periodically affecting backyard flocks, this section deserves special attention in 2026.

According to the Iowa Department of Agriculture, HPAI was detected in backyard flocks in Kossuth County in January 2026, followed by additional detections in Keokuk and Van Buren Counties in February 2026. Maryland confirmed its third case in commercial poultry in February 2026 as well. While the overall scale of outbreaks has been smaller than in 2025, the virus remains active and dangerous for domestic poultry.

HPAI symptoms in chickens include:

• Sudden death, sometimes without any prior visible symptoms
• Rapid drop in egg production
• Respiratory distress (gasping, coughing, sneezing)
• Extreme diarrhea
• Swelling around the head, neck, and eyes
• Purple discoloration of the head, legs, combs, and wattles
• Lack of energy and appetite

According to the University of Minnesota Extension, sudden onset and high death rates are common among all poultry with HPAI. In chickens, HPAI signs often include respiratory (gasping) and digestive (extreme diarrhea) signs followed by rapid death.

Your responsibility as a flock owner: If you see unusual illness or death in your flock, report it immediately. Early reporting triggers rapid response that can protect your neighbors’ flocks and the broader poultry industry. Our poultry farm biosecurity plan guide covers the daily practices that significantly reduce your risk.

Prevention: Keeping Your Flock Healthy Before Illness Strikes

The best approach to chicken health is preventing illness in the first place. Here are the practices that have kept my flocks healthy across multiple climates and years:

Clean, dry housing. According to multiple veterinary sources, stress and wet or dirty housing are the number one causes of illness for all types of chickens. Keep bedding dry, ensure proper ventilation, and clean regularly. For guidance, see how to keep a chicken coop from smelling.

Proper nutrition. Feed a balanced, age-appropriate diet. A quality layer feed provides the vitamins, minerals, and protein your hens need. Avoid overfeeding treats, which can dilute the nutritional value of their core diet. See our comprehensive feeding guide.

Biosecurity. Quarantine new birds for 30 days before introducing them to your flock. Wash hands before and after handling your birds. Keep wild birds away from your flock’s food and water.

Parasite management. Provide a dust bath area for natural external parasite prevention. Some keepers add food-grade diatomaceous earth to dust bath mixtures or sprinkle it in coop crevices as a supplemental deterrent against external parasites like mites and lice. The fine powder works mechanically by damaging the waxy coating on parasite exoskeletons, causing them to dehydrate. I include it in my own dust bath mix alongside play sand and wood ash, though it should be considered a supplement to proper coop hygiene, not a replacement for it. Always use food-grade diatomaceous earth (not pool-grade, which is a completely different and dangerous product), and avoid creating excessive dust clouds that you or your birds could inhale. See our best dust bath mix recipe and our guide on natural ways to keep parasites out of your coop. For internal parasite prevention, conduct regular fecal checks and work with your vet on a deworming schedule appropriate for your region. In the UK and Australia, Flubenvet (flubendazole) is the most commonly used licensed poultry wormer. In the US, fenbendazole products like Safe-Guard are more widely available.

Stress reduction. Avoid overcrowding, provide adequate roosting space, minimize handling stress, and address pecking order problems promptly.

Fresh water, always. Clean, fresh water available at all times. This single factor prevents more health problems than any other management practice.

Quick-Reference Symptom Table

Symptom	Possible Causes	Urgency Level
Lethargy, sitting puffed up	Many illnesses, egg peritonitis, dehydration	Moderate to High
Pale comb	Anemia, parasites, heat stress, coryza	Moderate
Purple/blue comb	Respiratory failure, HPAI, heart issues, fowl cholera	HIGH, call vet
Sneezing, coughing	Respiratory infection, coryza, HPAI	HIGH, isolate immediately
Tail bobbing	Respiratory distress, any breathing difficulty	HIGH, isolate and observe
Bloody droppings	Coccidiosis	HIGH, treat entire flock
Green watery droppings	Liver issues, Marek’s, HPAI, worms	Moderate to High
Stopped laying suddenly	Many causes, egg binding, disease, stress	Moderate
Swollen eyes/face	Coryza, mycoplasma, sinus infection	High
Limping	Bumblefoot, sprain, Marek’s, scaly leg mites	Moderate
Gaping/head shaking	Gapeworm	High
Paralysis	Marek’s disease, botulism, injury	HIGH, call vet
Sudden death	HPAI, Marek’s, heart failure, toxin, fowl cholera	CRITICAL, call vet/USDA
Swollen abdomen	Egg peritonitis, ascites, tumors	High
Weight loss	Worms, chronic disease, cancer	Moderate to High
Feather loss (not molting)	Parasites, bullying, nutritional deficiency	Moderate
Nasal discharge	Respiratory infection, coryza	High
Sour smell from beak	Sour crop, thrush/candidiasis	Moderate
Crusty raised leg scales	Scaly leg mites	Moderate

Frequently Asked Questions

Final Thoughts: Trust Your Instincts

After six years of keeping chickens across two continents, the most valuable advice I can offer is this: if something seems off about one of your birds, investigate. Even if you cannot name the exact problem, your instinct that “she is not acting right” is worth acting on. You know your flock better than any article or symptom chart ever could.

Pick her up. Check her over. Feel her keel. Look at her feet. Examine her eyes. Check her droppings. If everything looks fine, great. You will sleep better knowing you checked. If something is genuinely wrong, you just gave her the best possible chance by catching it early.

And remember, asking for help is always the right call when you are unsure. A good avian veterinarian is worth their weight in eggs.

About the Author: Oladepo Babatunde is the founder of ChickenStarter.com with over 6 years of hands-on experience raising more than 50 chickens across diverse climates. Drawing from training with the Nigerian Agricultural Extension Services and practical work adapting tropical poultry techniques to US, UK, Australian, and Canadian conditions, Oladepo provides data-driven, experience-backed guidance for backyard chicken keepers worldwide. His work is informed by USDA, APHIS, and American Poultry Association standards. He is not a licensed veterinarian. Always consult a qualified poultry DVM for chicken health concerns.