Why Does My Chicken Have Diarrhea?
Loose droppings have benign causes (heat, watery treats, cecal dumps) and serious ones (cocci, worms, infection) — frequency, color, and context separate them.
Most likely causes
Heat and hydration
What points to it: Hot weather, whole flock's droppings looser, birds drinking heavily and eating melon you provided.
What to do: Expected — more water in means more water out. No action if birds are bright.
Cecal droppings (not diarrhea)
What points to it: Every 8th-10th dropping is pudding-like, tan-to-brown, uniquely stinky — from the ceca, part of normal digestion.
What to do: None. The most commonly 'treated' non-problem in backyard flocks.
Coccidiosis
What points to it: Especially in chicks/growers: listless, hunched, ruffled birds with watery or BLOODY droppings, poor growth — can decimate young birds quickly.
What to do: Treat the water with amprolium (Corid) promptly per label for the whole group, keep litter dry, and see the bloody droppings guide. Medicated chick starter is prevention, not treatment.
Worms
What points to it: Chronic loose droppings with weight loss and pale combs in older birds on long-used ground.
What to do: Fecal test and deworm per the worms guide.
Diet swing or spoiled food
What points to it: Diarrhea the day after a treat flood, spoiled scraps, or a sudden feed switch.
What to do: Back to plain feed and water for a couple of days; transition feeds gradually; audit the scrap policy (the feeding hub's rules exist for this).
Vent gleet or infection
What points to it: Chronic pasty rear with smell — see the messy vent guide; persistent lone-bird diarrhea with decline suggests deeper infection.
What to do: Topical/probiotic care for gleet; vet fecal for the persistent decliner.
Check these first
Learn the poop chart: normal comes in a startling range. Note WHICH bird, how often, color (green = often diet/no food, yellow-foamy = worth a fecal, red/bloody = urgent), and check for heat, new treats, and pasted vents.
When it's probably nothing
Cecal droppings, broody mega-poops, watermelon-day output, and the first hot-week loosening are all normal. One weird dropping from a bright, eating bird is a shrug, not a diagnosis.
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.
📄 Free printable: The Chicken Never List
The 15 foods that can hurt your flock, on one page — print it, tape it inside the feed-bin lid.
Harold knows your flock's history
Homestead Paradise keeps your flock's health records, lay records, and feed history — so when something looks off, Harold answers with your birds' actual story, not generic internet advice. Snap a photo with Harold's Eyes and log what you find, so next time you'll know what worked.
Start your free 14-day trialMore symptom guides
Wondering if a treat caused it? Can chickens eat...? — verdicts for 112 foods →