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Why Does My Cat Keep Sneezing? Causes and When to See a Vet

Occasional sneezing is normal for cats, but when the sneezing is frequent, persistent, or accompanied by discharge, it usually signals an underlying condition. Understanding the common causes helps you decide how urgently your cat needs to be seen.

Cat Flu: The Most Common Infectious Cause

Cat flu is an umbrella term for upper respiratory infections, most commonly caused by feline herpesvirus (FHV-1) and feline calicivirus (FCV). These viruses cause sneezing, nasal discharge, eye discharge, conjunctivitis, mouth ulcers and lethargy. Cat flu is highly contagious between cats and is particularly common in multi-cat households, rescue environments and areas with unvaccinated cat populations.

Feline herpesvirus is a significant ongoing concern because once infected, cats typically become lifelong carriers. The virus can reactivate during periods of stress, causing recurrent bouts of sneezing and eye discharge even in previously recovered cats.

Vaccination against FHV-1 and FCV is part of the standard UK feline vaccination schedule and significantly reduces the severity of infection, though it doesn't completely prevent it. Keeping vaccinations current is the most important preventive measure.

Allergies and Irritants

Cats can develop sneezing in response to airborne irritants: cigarette smoke, air fresheners, cleaning products, perfumes and dust. Cats with atopic disease (environmental allergy) may sneeze alongside other signs including itchy skin and skin lesions.

Seasonal allergic sneezing in cats is less common than in dogs but does occur. Dust mite allergy is a year-round trigger. If sneezing correlates with specific products used in the home, trial elimination of those products is a reasonable first step before a vet visit.

Cats exposed to heavy cigarette smoke in the home are at elevated risk of several respiratory conditions including asthma, chronic rhinitis and lymphoma. Secondhand smoke exposure is a significant welfare concern for companion animals.

Dental and Oral Disease

The proximity of tooth roots to the nasal passages in cats means that dental disease — particularly tooth root abscesses in the upper jaw — can cause nasal discharge and sneezing. This connection is underappreciated by many owners.

If your cat is sneezing with a unilateral (one-sided) nasal discharge and also shows signs of dental pain — reluctance to eat hard food, pawing at the face, decreased appetite — dental disease should be on the diagnostic list.

Dental assessment and X-rays are usually performed under anaesthetic and can identify root abscesses not visible on oral examination. Treatment involves extraction of the affected tooth, which typically resolves the nasal symptoms.

Nasal Polyps and Tumours

Nasopharyngeal polyps — benign growths in the nasal passage or behind the soft palate — are relatively common in young cats and cause chronic sneezing, nasal discharge and sometimes voice changes. They can be removed surgically, often with a good outcome.

Nasal tumours (most commonly lymphoma or carcinoma) tend to affect older cats and cause progressive sneezing, unilateral or bilateral bloody discharge, and sometimes facial deformity as the tumour grows. Diagnosis requires imaging (CT scan) and biopsy.

Any cat with chronic, progressive nasal signs — particularly if one-sided, bloody or accompanied by facial changes — should be investigated promptly. Early diagnosis of nasal lymphoma allows for treatment with chemotherapy, which can provide extended good-quality remission.

When to See a Vet

Occasional sneezing without discharge or other signs in an otherwise healthy cat doesn't need urgent investigation. If sneezing has lasted more than 48–72 hours, is accompanied by coloured or bloody discharge, affects one side only, is associated with other signs (eye discharge, lethargy, loss of appetite, mouth ulcers), or is happening in a kitten or elderly cat, a vet visit is warranted.

Kittens and elderly cats are more vulnerable to upper respiratory infections and can deteriorate quickly — prompt veterinary attention for persistent sneezing in these groups is particularly important.

A cat that stops eating because of nasal congestion (cats rely heavily on smell to stimulate appetite) can become seriously unwell within 24–48 hours. If your sneezing cat has stopped eating, contact your vet the same day.

Find a Vet Near You

If your cat's sneezing is persistent or accompanied by other symptoms, book a vet appointment promptly. Use CompareMyVet at app.comparemyvet.uk to find and compare vet practices near you and understand consultation costs in your area.