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A prolapsed vent is when the tissue that normally pushes out briefly as a hen lays an egg fails to go back in, leaving red, moist tissue hanging from her vent. Mild cases can often be managed by isolating the hen, keeping her vent clean and pausing her laying, but a prolapse can quickly become life-threatening if other hens peck at it. Here is what causes it, what to do first and when to call a veterinarian.
Key Takeaways
- The vent turns out briefly with every egg; a prolapse is when it does not retract.
- Main risk factors are obesity, hens starting to lay before they are fully grown, too much or too early extra light, and large or double-yolked eggs.
- First steps: separate the hen, keep the vent clean and stop her laying for a while.
- Other hens pecking the tissue can pull out the oviduct and intestines, which is fatal, so isolate her right away.
- See a veterinarian if the tissue is bleeding, swollen or will not go back in; any antibiotic needs a vet’s prescription.
Correction: an earlier version of this article included an invented breed-susceptibility table, pelvic-muscle exercises, abdominal slings, honey and coconut oil as cures, and unsupported claims that infections, parasites and vitamin or calcium shortages cause prolapse, and it did not explain the documented first-aid steps.
What a prolapsed vent is
When a hen lays, the end of her oviduct (the vagina) turns out through the cloaca to deliver the egg and then pulls back in. If that tissue is injured, for example by a large or double-yolked egg, or if the hen is fat, it may not retract right away and stays exposed.
You may notice pink or red tissue protruding from the vent, a swollen vent, a hen hiding in the nest box, or blood around the vent if other birds have been pecking at her.
What causes it
Merck Veterinary Manual links vent and oviduct prolapse to:
- Obesity. Fat hens retract the tissue slowly. Too many treats and scratch grains make this more likely; see can you overfeed chickens.
- Laying too early. Pullets that come into lay before they are fully developed are at higher risk.
- Too much or too early extra light. Artificial light that pushes young pullets into lay early, or excessive light stimulation, is a known risk factor.
- Large or double-yolked eggs, which can injure the tissue.
- Uneven body weights within a flock.
Breed rankings, weak pelvic muscles, parasites and specific vitamin shortages are not documented causes. A related laying problem is egg binding; read our egg-bound chicken guide if you suspect a stuck egg.
Why a prolapse is an emergency
Exposed tissue invites pecking. If flockmates peck at a prolapse, they can pull the entire oviduct and part of the intestine out of the body, which is called peckout. Hens can die from blood loss or shock. A prolapse can also swell so much that it cannot go back in (blowout), which can also be fatal.
That is why the first thing to do is get the hen away from the rest of the flock.
What to do for a mild prolapse
- Isolate the hen in a clean, quiet pen or crate where no other birds can reach her.
- Keep the vent clean. Gently remove droppings and litter from the tissue and surrounding feathers, and keep her bedding clean until the tissue retracts.
- Stop her laying for a while. Merck advises reducing the light she gets or sharply reducing the energy in her diet, so the tissue is not pushed out again with each egg.
- Watch her closely every day for bleeding, swelling or tissue that does not go back in.
Do not use home remedies such as honey, coconut oil or slings; none is a documented treatment. Do not try surgery at home.
When to see a veterinarian
Contact a veterinarian who treats poultry if:
- The tissue is bleeding, torn or has been pecked
- It is very swollen or will not go back in
- The prolapse keeps coming back
- The hen stops eating, drinking or passing droppings
Pushing the tissue back in without training can injure it, so let a vet do this or show you how. Give pain relief only as prescribed. Drugs not labeled for chickens are extra-label and need a vet’s direction and an egg withdrawal time. If infection sets in, remember that since June 2023 medically important antibiotics for chickens require a veterinarian’s prescription in the US.
If a hen has severe damage, repeated prolapses or peckout, discuss humane euthanasia with your veterinarian.
How to prevent prolapse
- Keep hens at a healthy weight: feed a complete layer ration and limit treats and scratch.
- Do not use extra light to bring young pullets into lay early. Let them reach full size first.
- Avoid overcrowding, which increases pecking.
- Check hens regularly and isolate any bird with a red or swollen vent before the flock notices it.
- Feed a balanced diet; Merck lists avoiding nutritional deficiencies as part of preventing cannibalism. See our guide to calcium for chickens for layer nutrition basics.
FAQs
Can a prolapsed vent heal on its own?
Mild cases can resolve once the hen is isolated, kept clean and stops laying for a while. If the tissue is bleeding, swollen or will not retract, she needs a veterinarian.
Should I push the prolapse back in?
Not unless a veterinarian has shown you how. Untrained handling can damage the tissue. Keep it clean and protected from other birds while you get help.
How do I stop a hen from laying so the prolapse can heal?
Merck recommends reducing the light she gets or sharply lowering the energy in her diet. Ask your vet which approach suits your hen.
Can a hen with a prolapse go back to the flock?
Only once the tissue has fully retracted and healed with no red, raw areas that could attract pecking. Watch her closely after she returns.
Conclusion
A prolapsed vent needs quick action: separate the hen, keep her clean and pause her laying. Call a vet for bleeding, swelling or tissue that will not go back in, and prevent future cases by keeping hens lean and not rushing pullets into lay.
Sources
- Merck Veterinary Manual: Common Management-Related Problems in Backyard Poultry
- Merck Veterinary Manual: Prolapse of the Oviduct in Poultry
- FDA: GFI #263 Frequently Asked Questions for Farmers and Ranchers
- FDA: The Ins and Outs of Extra-Label Drug Use in Animals
- Poultry Extension (extension.org): Poultry End-of-Life Situations in Small and Backyard Flocks
Checked September 2026. Labels change, so always read the label on the product you buy. See our editorial policy for how we research health articles.
