This chart lists some of the most common sickness, illnesses and diseases chickens could get. This chart contains a list of symptoms and links to possible treatments for each. Keep in mind that chickens who get one illness often get several more if the first one is left untreated which is why it is very important to isolate sick birds away from your flock. Some chicken illnesses are air borne so you do not want to put your quarantined sick bird in the same coop or same room as your well birds. This chart is not in alphabetical order at this time. Once you quarantine the sick bird you should check each chicken individually for signs of illness as well. Identify what type of illness your chicken may have using the chart below. If you are unsure or do not see the symptoms your birds have you should contact your local poultry and livestock veterinarian for treatment options. It is vitally important to clean and disinfect everything in your chicken coop including the dirt with a high quality cleaner/disinfectant on a weekly or monthly basis, as well as, after you have removed sick birds from the flock in a attempt to prevent the spread if it is contagious. I use Tek-Trol Disinfectant Cleaner Concentrate because this is the one many veterinarians use, cleaning and disinfecting can be done in one operation, and it can be used in kennels, poultry barns, and in breeder and laying operations, in backyard chicken coops, and on the soil. It is not flammable and dissolves in hot or cold water without losing it's disinfectant properties. Note: I may receive a small commission on eligible purchases but I am recommending this product based on the fact that I use it and it is an excellent choice for poultry house cleaning and disinfecting.​

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Crop Canker	Symptoms of Crop Canker: Lesions-Yellow-white, encased necrotic nodules which cause an obstruction Green saliva Cheesy like lesions in the digestive tract	Go to Crop Canker Treatments
Eye Worm	Symptoms of eye worm are swollen puffy eye, redness around the eye, drainage, listlessness	Go to Eyeworm ​Treatments
Cecal Coccidiosis	Symptoms of Coccidiosis parasite is blood in their feces (poop), paleness, listlessnes	Go to Cecal ​Coccidiosis Treatments
Heat Stress	Chest deformities, such as kyphosis Chest injuries Chest muscle weakness Chronic lung disease   Confusion Easy fatigue Lethargy Shortness of breath Sleepiness   Weakness and deteriorated condition	Go to Acidosis (heat stress) in chickens: signs, prevention, and treatment
Necrotic Enteritis	Symptoms of Necrotic Enteritis: Eats less Dark blood stained feces with a strong fetid odor Severely infected chickens will have diarrhea. Abnormally thin or weak	Go to Necrotic Enteritis, ​Symptoms & Treatments
Foot Problems	Limping, holding one foot up, scabs on bottom of foot	How to treat foot problems
Fowl Pox	Dry form Symptoms Listlessness Slowed growth rate Noticeable decline in egg production (see Table 1 ). Raised Wart-like lesions on head, legs, vent and other feathered areas  Lesions  Wet form Symptoms: Canker sore type lesions in: Mouth  Pharynx Larynx Trachea Respiratory distress which obstructs upper air passages	Go to Fowl Pox ​Symptoms & Treatments
Leg Problems	Limping Walking crooked Lumps Sores Splayed Legs-Signs & Treatments: Hobbling Chickens Raised scales Listlessness Pale comb and/or wattles	Go to Leg problems in chickens/signs/symptoms/treatments
Prolapse/Egg Peritonitis/Egg Stuck Inside Hen	Hen sitting around more than usual ​Never sitting down Standing more upright with legs spread apart Listless Pale comb Swollen or hard abdomen, redness Blood around the vent area	Go to Egg Bound/Prolapse/Egg Peritonitis Symptoms & Treatments See How to tell if your hen is egg bound
Marek's Disease	Skin form-Enlarged reddened feather follicles, white bumps on skin that form crusty scabs". Nerve form-Progressive paralysis in leg or wing, weight loss, labored breathing, diarrhea, starvation and death   Ocular (eye form)-  Gray eye color,  misshaped iris, weight loss, blindness, and death.  Internal-organ form-Tumors on internal organs.	Go to Marek's Disease Signs, Symptoms & Prevention
​Newcastle Disease	Hoarse chirps (in chicks) Watery discharge from nostrils Labored breathing (gasping) Facial swelling Paralysis Trembling Twisting of the neck (sign of central nervous system involvement) Eat less feed Drink less water Significant drop in egg production	Go to Newcastle Disease Symptoms & Treatments
​Respiratory Disease	​Symptoms: Mild Lesions Coughing Sneezing Rales Difficulty breathing Foamy eyes Reduced growth rate Loss of egg production ​Can be more severe when combined with other diseases.	​​​Respiratory Disease-Kinds-Signs, Symptoms & Treatments Chronic Respiratory Disease (CRD) Symptoms & Treatments​
Wry Neck Syndrome	Twisted neck, bent neck, head looking sideways toward the sky	Go to Wry Neck-Causes, Symptoms & Treatments
Ascite Syndrome	Most often found in meat birds Abdominal redness Slowed or stopped growth rate ​Birds lay on their backs when dying & ​Have purple face	Go to Ascites-Signs, Symptoms & Treatment
Lymphoid Leukosis	​Lack of appetite Weakness Diarrhea Dehydration Emanciation ​Depression right before death Sometimes an enlarged bursa Enlarged liver ​Paralysis Infected birds may not always develop tumors you can see but they will lay fewer eggs.	Go to Lymphoid Leukosis Treatments
Candidiasis/Thrush/Sour Crop/Crop Mycosis	White, yellowish or cheesy substance in mouth	See symptoms and available treatments for Candidiasis/Thrush/Sour Crop/Crop Mycosis
Fungal  Mycotic Disease	​Stunted growth Diarrhea Fatal Avian Encephalitis ( AE is a viral disease found in young chickens, turkeys, Japanese quail, pheasants, and pigeons).	See Causes, Symptoms & Treatments for Fungal Mycotic Disease
Gape Worm	Spitting Making gurgling sounds	Gape worm Symptoms, Prevention & Treatment Coccidiosis signs symptoms & treatments in poultry​​