Fluffed on the perch when she wouldn’t normally be, slower to come to feed, watching the room instead of joining it — nothing that fits under a cough or a mite or a crop that stayed full, but plainly not right. That’s when whole-body illness is the honest place to start looking.
Whole-body means the trouble isn’t confined to one system you can point to. Ascites — the water belly you hear about in chickens — is fluid in the abdomen that starts with a heart under strain: not an infection you can catch, not a mite you can treat, but a failing organ leaking where it shouldn’t. Marek’s, proventricular dilatation disease, chronic liver trouble, and the systemic infections belong on the same shelf because they present the same way from the outside — a bird that’s off, and you can’t tell why from looking.
The honest answer is the same one for most of them. You can’t diagnose systemic illness in a bird from across the room — a vet doing a real exam, sometimes with an ultrasound or a blood panel, is how the actual answer surfaces. What can be said from a distance is which family of trouble you’re likely in. For the wider map of what else can go wrong, our bird health guide sits behind these pages.
A bird off feed for more than a day, or losing weight without an obvious cause, needs a vet. Talk to an avian vet.
Water belly is fluid trapped in a chicken's abdomen from a failing right heart — a chronic condition a vet can drain for comfort but can't cure, and one worth catching early.
Scaly leg mites burrow under the scales on a hen's legs and lift them into rough, chalky ridges — the earliest signs to catch, and the treatments that kill the mite without damaging the leg underneath.
Mites hide in the feather bases and in coop cracks, not just on the bird — a look at which mite you're dealing with, and the two-front treatment that clears them for good.
The dosing walkthrough for the antiparasitic most bird keepers ask about — what it treats, and where a vet must confirm.
Bird flu — avian influenza — is a family of viruses that live naturally in wild birds.
