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Why Is My Cat Sneezing?

CatMonitor
Quick Answer

Occasional sneezing from dust or irritants is normal. Frequent sneezing, especially with eye or nasal discharge, usually indicates a feline upper respiratory infection ("cat cold") which is common and usually resolves in 7-14 days. Persistent sneezing without discharge may indicate allergies.

What You Need to Know

Sneezing in cats is most commonly caused by feline upper respiratory infections (URIs), which are the feline equivalent of a human cold. These are extremely common, highly contagious between cats, and usually self-limiting.

Feline herpesvirus (FHV-1) and feline calicivirus (FCV) account for 80-90% of upper respiratory infections. FHV-1 causes sneezing, nasal discharge, and eye discharge (often watery to thick). Once infected, cats carry herpesvirus for life and may have recurring flare-ups during stress. FCV typically causes sneezing plus mouth ulcers.

Most cat URIs resolve in 7-14 days with supportive care. The main concern is that a congested cat can't smell food, and cats who can't smell won't eat. This is where URIs become medically significant — secondary inappetence can lead to hepatic lipidosis in as little as 2-3 days.

Chronic sneezing (lasting weeks to months) without typical URI signs may indicate allergies (uncommon in cats compared to dogs), nasal polyps, nasal tumors, dental disease with oral-nasal fistula, or a foreign body lodged in the nasal passage.

One-sided nasal discharge (from only one nostril) is more concerning than bilateral discharge — it may indicate a nasal tumor, foreign body, or fungal infection and should be investigated.

Common Causes

  1. Upper respiratory infection — feline herpesvirus or calicivirus ("cat cold")
  2. Dust, litter dust, or irritants — occasional sneezing from particulates
  3. Allergies — less common in cats than dogs, but possible
  4. Dental disease — tooth root infections can create oral-nasal fistula
  5. Nasal polyps — benign growths in the nasal passages, more common in young cats
  6. Nasal tumors — more common in older cats, often one-sided discharge
  7. Foreign body — blade of grass, seed, or debris inhaled into nasal passage
  8. Feline herpesvirus flare-up — recurring episodes triggered by stress

Breed Variations

Flat-faced breeds (Persians, Himalayans, Exotic Shorthairs) have narrower nasal passages and are more prone to chronic sneezing and nasal discharge. They're also more susceptible to severe URI complications. Siamese and Oriental breeds seem more susceptible to URI infections. Kittens in shelters or multi-cat households have the highest URI rates.

When to Worry

See a vet if sneezing is accompanied by thick yellow or green nasal discharge, if there is blood in the nasal discharge, if only one nostril is affected (one-sided discharge), if your cat has stopped eating for more than 24 hours, if there is labored breathing (open-mouth breathing in cats is always an emergency), or if symptoms haven't improved after 10-14 days.

When NOT to Worry

Occasional sneezing (a few times a day) with no discharge in an otherwise healthy cat is usually just environmental irritation. A mild URI with clear discharge and normal appetite that improves over a week is not a concern.

Home Care Tips

Use steam therapy: bring your cat into the bathroom while you run a hot shower for 10-15 minutes to help clear congestion. Gently wipe nasal and eye discharge with a warm, damp cloth. Warm food slightly to enhance aroma (congested cats can't smell). Switch to wet food if they won't eat dry. Use a low-dust litter. Run a humidifier. Keep the sick cat separated from other cats for 2-3 weeks.

When to See a Vet

If symptoms persist for more than 24–48 hours, worsen, or are accompanied by lethargy, loss of appetite, or pain, see your vet promptly.

When in doubt, call your vet. A quick phone consultation can help you decide if an in-person visit is needed.

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