Illness in Chickens

Raising chickens is rewarding, but like all animals, there exists the possibility of occasional illness. Whether you’re a first-time flock owner or a seasoned chicken keeper, understanding common poultry diseases—and how to spot them early—can make all the difference. At Valley Hatchery, we care about the long-term health of your birds. Here’s what you need to know about illnesses in chickens and how to keep your flock thriving.

Common Signs of Illness in Chickens

Chickens are prey animals, which means they often hide signs of weakness or illness. That’s why early detection is key. Keep an eye out for these common symptoms:

• Lethargy or lack of activity
• Loss of appetite or weight loss
• Sneezing, coughing, or nasal discharge
• Diarrhea or abnormal droppings
• Pale combs or wattles
• Labored breathing or gurgling sounds
• Isolation from the flock
• Droopy wings or balance issues

If something seems “off,” it probably is. Isolate sick birds immediately to prevent spreading illness to the rest of the flock.

Common Chicken Illnesses

1. Respiratory Infections
Examples: Infectious Bronchitis, Mycoplasma, CRD (Chronic Respiratory Disease) — These illnesses often spread quickly and may be triggered by poor ventilation or stress. Symptoms include coughing, sneezing, and nasal discharge.

2. Coccidiosis
This is a common parasitic disease, especially in young birds. Symptoms include diarrhea (sometimes bloody), weakness, and weight loss. Good sanitation and medicated feed for chicks can help prevent it.

3. Marek’s Disease
Caused by a virus, Marek’s can lead to paralysis, tumors, and death. It’s highly contagious, but vaccination (usually done at hatcheries like ours) offers strong protection.

4. Egg Bound
This occurs when a hen is unable to lay an egg. Signs include a puffed-up appearance, straining, and sitting in the nesting box for long periods. It’s a medical emergency and requires prompt attention.

5. Avian Influenza (Bird Flu)
Though rare in small backyard flocks, this serious viral disease is highly contagious and often fatal. Symptoms include sudden death, blue discoloration of combs, and respiratory distress.

6. External Parasites
Examples: Mites and lice — These pests can cause skin irritation, feather loss, and anemia. Regular inspections and dust baths help keep infestations under control.

7. Internal Parasites
Worms can quietly affect your chickens’ health. Look for poor weight gain, pale combs, or worms in droppings. Deworming on a regular schedule can help manage this.

Prevention is the Best Medicine

Keeping chickens healthy doesn’t have to be complicated. Follow these tips:

• Buy from reputable hatcheries. At Valley Hatchery, we offer vaccinated chicks and prioritize biosecurity.
• Clean often. Regularly clean coops, feeders, and waterers.
• Provide proper nutrition. A balanced diet supports strong immune systems.
• Quarantine new birds. Isolate any new chickens for 2–4 weeks before introducing them to your flock.
• Minimize stress. A calm, well-maintained environment lowers disease risk.

When to Call the Vet

If symptoms are severe, spreading quickly, or not improving with basic care, don’t wait—consult a poultry-savvy veterinarian or contact your county Ag extension office for advice. Prompt intervention can save lives and reduce the risk of a full-blown outbreak.