What nose discharge can look like
Cat nose discharge can be clear and watery, thick and cloudy, yellow or green, or tinged with blood. It may come from one nostril or both, and may appear with sneezing, eye discharge or noisy breathing. The look of the discharge is a useful clue, but it cannot give a diagnosis on its own.
Common causes
- Viral upper respiratory infections: feline herpesvirus and calicivirus are frequent causes. See our guide to the cat cold.
- Bacterial infection: may occur on its own or after a viral infection.
- Allergies and irritants: dust, smoke, strong scents or some litters may irritate the nose.
- Foreign material: a blade of grass or other small object can lodge in the nose.
- Dental disease: infected tooth roots in the upper jaw can affect the nasal passages (see what healthy cat teeth look like).
- Polyps or tumors: growths in the nose or throat can cause long-lasting discharge or noisy breathing.
- Fungal infection: less common, but possible in some cats.
What the type of discharge may suggest
These are general patterns, not rules.
- Clear and watery: often linked to early viral infection, allergies or irritants.
- Thick, yellow or green: can suggest infection, often with bacteria involved.
- Bloody: may be caused by injury, a foreign object, severe infection or a growth. It should always be checked by a vet.
One nostril or both?
Discharge from just one nostril can raise the possibility of a foreign object, a polyp, a growth or a dental problem. Both sides are more often seen with infections or allergies. Either way, a persistent pattern is worth a vet visit.
Sneezing without discharge
A cat that sneezes without discharge may be reacting to dust or a scent, or may have an early infection. An occasional sneeze is usually not a concern. Frequent or worsening sneezing, or sneezing with other signs, is a reason to call your vet.
What a vet may do
Your vet will examine the nose, mouth, eyes and breathing. Depending on what they find, they may suggest:
- Tests for FIV and FeLV, which can affect the immune system
- Blood and urine tests
- Swabs or PCR tests for infectious agents
- A dental exam, sometimes under anesthesia (see what a cat dental procedure involves)
- X-rays or other imaging of the nose and skull
- Looking into the nasal passages or flushing them, usually under anesthesia
Treatment depends on the cause
There is no single treatment. Supportive care may be enough for a mild viral infection. Bacterial infections may need antibiotics prescribed by a vet. Dental disease may need dental treatment, and foreign objects, polyps or growths may need to be removed. Long-lasting inflammation in the nose can need ongoing management.
Gentle home care
While you arrange a vet visit, you can:
- Wipe the nose gently with a soft, damp cloth
- Keep your cat warm and the room free of smoke and strong scents
- Offer aromatic, slightly warmed wet food if appetite drops
- Keep water available
Avoid giving human decongestants or nasal sprays, since many are unsafe for cats.
When to see a vet
Contact your vet if the discharge:
- Lasts more than a few days
- Is thick, yellow, green or bloody
- Comes with loss of appetite, tiredness, fever or coughing
- Comes with eye discharge or swelling around the face
Get urgent help if your cat is breathing with an open mouth or seems to be struggling to breathe. If your cat also has a cough, our guides to cat coughing mucus and a changed or hoarse voice may be useful.
Frequently asked questions
How do I treat an upper respiratory infection in my cat? Mild cases are often managed with supportive care, while more serious or lasting cases may need medication from a vet. Check with a vet before giving anything.
What does nasal lymphoma look like in cats? Nasal tumors can cause long-lasting discharge, sometimes bloody, sneezing, facial swelling or noisy breathing, but these signs overlap with many other problems. Only a vet using tests can tell them apart.
Should I be worried if my cat sneezes but has no discharge? Occasional sneezing is common. If it becomes frequent, persistent, or comes with other signs, have your vet take a look.