What causes swollen eyes and nasal discharge in chickens? | arlo.® Atlas
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Overview
Swollen eyes and nasal discharge in chickens usually point to irritation or a respiratory problem, but there can be several possible causes. It may be something simple like dust, ammonia build-up or a minor eye issue, or it could be an infection affecting the sinuses and airways.
Because chickens often hide illness early, it’s worth checking the bird closely and keeping an eye on the rest of the flock. You can often spot helpful clues without needing to jump to conclusions.
Things To Check
1. Check whether one eye or both eyes are affected, and whether the swelling is mild or increasing.
2. Look for nasal discharge, bubbling at the nostrils, sneezing, breathing noise or mouth breathing.
3. See if the eye looks red, watery, sticky, cloudy or partly shut.
4. Check the bird’s appetite, activity level and whether it is keeping up with the flock.
5. Look at the coop for dust, poor ventilation, damp bedding or a strong ammonia smell.
6. Notice whether any other birds are showing similar signs, which can suggest a flock-level issue.
7. Check for possible irritants such as bedding particles, feed dust, pecking damage or a foreign body around the eye.
Common Causes
Dust, poor ventilation or ammonia in the coop can irritate the eyes and nose and lead to watering, swelling or discharge.
Minor eye irritation or injury may cause one eye to swell first, especially if there’s a scratch, peck or bit of debris involved.
Respiratory infections are another common reason, and these may also cause sneezing, noisy breathing, reduced appetite or a drop in egg laying.
Sinus infection or inflammation can cause puffiness around the eyes, along with discharge from the nostrils.
Less commonly, more serious infectious disease or a foreign body may be involved, especially if several birds are affected or the signs are worsening.
What To Do
Start by separating the affected bird if it looks unwell, so you can monitor it more closely and reduce stress from flock pecking.
Improve ventilation, remove wet bedding and reduce dust in the coop if possible. A cleaner, drier environment can make a real difference to irritation-related signs.
Keep a close eye on breathing, appetite and alertness over the next day or two. Take note if the discharge changes colour, the swelling increases or other birds begin to show symptoms.
Offer easy access to clean water and feed, and make sure the bird can rest somewhere calm and warm.
When To Contact A Vet
Speak to your vet promptly if the chicken is struggling to breathe, the eye is very swollen or closed, the discharge is thick or worsening, or the bird seems dull, off food or rapidly unwell. It’s also sensible to get advice if more than one bird is affected, because flock respiratory problems can spread.
Products That May Help
Good coop and flock hygiene can be helpful as part of managing dust, damp and general cleanliness around birds showing respiratory signs.
Related Questions
Why is one eye swollen on my chicken?
Can dusty bedding cause eye and nose irritation in chickens?
Why is my chicken sneezing with a runny nose?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.