Why Does My Chicken's Breathing Sound Rattly or Wheezy?
Audible breathing — rattles, clicks, wheezes — means something in the airway: infection is most common, gapeworm the classic wildcard.
Most likely causes
Respiratory infection
What points to it: Rattling with sneezing, discharge, swollen sinuses, reduced appetite; often after new birds joined or weather stress.
What to do: Isolate, warmth, hydration, vet involvement for diagnosis and targeted treatment — see the sneezing guide; rattles are the same disease family a stage deeper.
Gapeworm
What points to it: Bird stretches its neck and gasps ('gaping'), shakes head, breathing clicks — a worm that literally lives in the windpipe; likelier in birds eating earthworms/slugs on old ground.
What to do: Specific dewormers handle it (fenbendazole per vet guidance) — regular mite treatments won't. A vet fecal test confirms.
Aspergillosis (moldy environment)
What points to it: Gasping/rattling without discharge or spread between birds, tied to moldy bedding, wet feed, or a damp corner — the mold attacks lungs directly.
What to do: Remove the moldy source completely and improve ventilation; advanced cases have poor outcomes, so prevention (dry litter, dry feed) is the real treatment.
Heart/heat strain
What points to it: Open-mouth effortful breathing in heat or in a heavy older bird after exertion — more distress than noise.
What to do: See the panting guide; cool and calm the bird and reassess.
Check these first
Listen with the bird calm (not post-chase): rattle location matters — throat clicks with neck-stretching suggest gapeworm; facial involvement suggests infection. Audit bedding and feed for damp or mold the same day.
When it's probably nothing
The weird growly noises of an annoyed broody and a rooster's post-crow throat-clearing are vocal, not respiratory.
This guide is experienced-keeper guidance, not veterinary care. When a bird is crashing or a symptom is spreading, a poultry vet or your state extension lab is the right call — fast.
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