Sick Chicken Symptom Checker

How to use it

Tick only what you can actually see, not what you suspect. The tool covers 22 signs across 6 areas — breathing, eyes & sinuses, crop & digestion, legs & feet, laying & vent, comb & head, whole bird & flock — and the combination matters more than any single item. A sneeze on its own usually means dust. A sneeze with a foamy eye means something else entirely.

Then read the urgency banner first and the list of possibilities second. Knowing whether you have hours or days is more useful than a name, and it is the part you can act on without a diagnosis.

A worked example

Suppose one hen is sneezing and has froth in the corner of one eye. Tick those two and the checker returns Act today: not an emergency, but something to act on today, and the bird should come out of the flock because respiratory disease travels on aerosols and respiratory secretions.

The likeliest match is Mycoplasma gallisepticum (chronic respiratory disease). The important part is not the name though — it is the consequence. Isolate the bird and speak to a vet. The decision this forces is bigger than the illness: Merck states infected birds "remain infected for life" and act as carriers, and that antibiotics such as tylosin and tetracyclines "may alleviate clinical signs and lesions but do not eliminate infection." A treated bird is a recovered-looking carrier, so a closed flock is the usual advice afterwards — no selling or gifting birds or hatching eggs.

That is the kind of thing worth knowing before you buy six more pullets at the feed store, and it is why the tool leads with what a diagnosis would commit you to rather than with a treatment list.

Where this tool refuses to help

Four of the most-searched backyard chicken treatments are not in the veterinary literature, and this tool says so rather than repeating them. That is not squeamishness — each one can make things worse:

• Bumblefoot surgery. Merck's entry gives no treatment protocol at all, only prevention through litter management. Cutting into an infected footpad can drive infection deeper into the joint.
• Sour crop dosing. Merck states plainly that "no approved products are available for the treatment of candidiasis in the US". And never invert a bird to empty her crop — aspiration kills faster than the yeast does.
• The egg-binding bath. Warm Epsom soaks and oral calcium are everywhere online and may well be what your vet advises. We could not find them in a veterinary source for chickens, so we will not hand you doses.
• The coryza smell test. "Foul-smelling discharge means coryza" is repeated constantly. Merck's coryza entry describes a serous discharge and never mentions odour.

An admitted gap is more useful than an invented dose. Where the evidence stops, the honest next step is a vet — see the methodology note for how the rest of the site is sourced.

The one thing most keepers do not know

USDA APHIS asks backyard keepers — not just commercial operations — to report sick birds and unusual deaths, on a free line: 1-866-536-7593, or your state veterinarian.

The reason this matters is that the published warning signs — sudden death, swelling of the head and wattles, purple discolouration, breathing trouble, a collapse in laying — overlap almost exactly with ordinary backyard complaints. That overlap is precisely what talks people out of calling: it looks like the thing that went around last spring. The system is designed for keepers who are unsure, and a call that turns out to be nothing costs you nothing.

Frequently asked questions

When should I call a vet for a sick chicken?

Same day, without waiting to see how it looks tomorrow, if a bird is breathing with her beak open at normal temperatures, her comb or wattles have gone purple or blue, she is straining as if to lay and producing nothing, or there is tissue protruding from her vent. Those four are emergencies. Beyond that, a bird who is hunched, fluffed and off her feed is usually further into an illness than she appears — chickens are prey animals and hide illness until hiding it stops working.

When do I have to report sick chickens to the authorities?

USDA APHIS asks backyard keepers to report sick birds or unusual bird deaths, and publishes a list of signs to watch for: sudden death, swelling of the head, eyelids, comb or wattles, purple discolouration, breathing difficulty, nasal discharge, a sharp drop in laying, and soft-shelled or misshapen eggs. Several birds dying suddenly is worth reporting on its own. You can call your state veterinarian or USDA on 1-866-536-7593. Reporting is free and costs you nothing if it turns out to be something ordinary — and the whole point of the system is that keepers call before they are certain.

My chicken is sneezing — is that serious?

On its own, often not. A coop that is dusty, or bedded deep in litter that has gone damp, irritates airways; if you can smell ammonia at roost height it is already high enough to damage the airway lining, and the fix is ventilation and dry bedding rather than medicine. It becomes a health question when the sneeze arrives with company: foam or bubbles in the eye, rattling breath, discharge crusting the nostrils, or swelling around the face. That combination points at an infection and the bird should be separated from the flock.

Can chickens recover from a respiratory infection?

They can look completely recovered and still be infectious, which is the part that catches people out. For Mycoplasma gallisepticum, the Merck Veterinary Manual states that infected birds "remain infected for life" and act as carriers, and that antibiotics "may alleviate clinical signs and lesions but do not eliminate infection." So a treated bird is a healthy-looking carrier. That is why the usual advice after a mycoplasma diagnosis is a closed flock — no selling or gifting birds or hatching eggs — rather than simply finishing a course of medication.

Is this symptom checker a substitute for a vet?

No, and it is not a diagnosis. It organises published veterinary information — mostly the Merck Veterinary Manual — so you can tell an emergency from something to watch, and walk into a consultation knowing what to describe. Where the popular home remedy has no veterinary source behind it, this tool says so rather than repeating it; you will see that on bumblefoot, sour crop, impacted crop and egg binding. Naming the limits of the evidence is more useful than a confident answer that nobody can stand behind.

Should I treat a sick chicken myself or cull her?

That is genuinely your call, and it depends on things a website cannot see: whether she is a pet or livestock, whether a vet who treats poultry is within reach, and what the diagnosis implies for the rest of the flock. What is worth knowing before deciding is that some conditions are individual problems and others are flock problems. A stuck egg or a footpad injury concerns one bird. Mycoplasma and Marek's are decisions about every bird you own and every chick you ever add. Get the diagnosis first — the answer often changes once you have it.