Why Is My Cat Sneezing? Causes and When to Call a Vet

Common causes of sneezing in cats

PDSA lists cat flu and other respiratory infections, irritants such as dust, perfume and smoke, dental disease, a foreign object in the nose, and nasal growths among recognised causes. The pattern and accompanying signs matter more than the sound of the sneeze itself.

Cat flu is a common upper-respiratory illness, most often associated with feline herpesvirus or feline calicivirus. Cats Protection notes that affected cats may also have runny eyes or nose, fever, mouth ulcers, drooling, tiredness and reduced appetite. Some recovered cats remain carriers and can have flare-ups during stress or illness.

• Infection: repeated sneezing plus eye or nose discharge, fever or low energy.
• Irritation: a short episode linked to dust, smoke, perfume, sprays or cleaning products.
• Dental disease: sneezing with bad breath, drooling, chewing changes or facial discomfort.
• Foreign material: sudden, forceful bouts, pawing at the face or one-sided discharge.
• Nasal disease: persistent or one-sided signs, blood, noisy breathing or facial swelling.

Is pollen or mould a likely UK-specific cause?

Pollen counts and damp homes make allergy an understandable suspicion, but repeated feline sneezing should not automatically be labelled hay fever. Irritants and inflammatory airway disease can occur, yet infection, dental disease and material lodged in the nose are important alternatives that need to be ruled out.

Keep a simple note of when the sneezing happens and any household exposure: a new aerosol, fireplace smoke, dusty litter, decorating, visible mould or time outdoors. This history can help your vet, but it is not a substitute for examination. Do not use human antihistamines or decongestants unless your vet has prescribed the exact medicine and dose.

How to tell cat flu from an occasional sneeze

An occasional sneeze leaves the cat otherwise completely normal. Cat flu usually produces a cluster of signs: repeated sneezing, watery or sticky discharge, sore eyes, a snotty nose, reduced appetite, fever or mouth ulcers. Kittens can deteriorate more quickly because their immune systems are immature.

Vaccination greatly reduces the risk of severe disease but does not guarantee that a cat will never develop symptoms. If you suspect cat flu, tell the veterinary receptionist before arriving; the practice may ask you to wait away from other cats because the infection spreads readily through secretions and contaminated bowls or bedding.

What you can safely do at home

For a cat already assessed by a vet or one with very mild signs while you await advice, keep the room calm and well ventilated, remove smoke and fragranced sprays, and make fresh water easy to reach. Gently wipe discharge from around the eyes or nose with separate clean damp pads.

Congestion can reduce a cat's ability to smell food. Cats Protection and PDSA advise that slightly warming familiar food may make it more appealing. A steamy bathroom may loosen mucus if the cat chooses to sit there, but never confine or stress them. Essential oils, vapour rubs and human cold remedies are not safe substitutes for veterinary treatment.

What your vet may investigate

Your vet will consider vaccination history, contact with other cats, how long the signs have lasted and whether discharge comes from one or both nostrils. They will examine the eyes, mouth, teeth, nose, throat, temperature and breathing.

Persistent, recurrent or one-sided signs may need further investigation, which can include swabs, blood tests, dental imaging or imaging of the nasal passages. Antibiotics do not treat viruses and are used only when a vet suspects an appropriate bacterial component. Treatment depends on the cause rather than sneezing alone.

How to monitor the sneezing pattern

Record the date, number of bouts, appetite, energy, breathing and the colour and side of any discharge. A short phone video can be useful because cats often stop showing the behaviour in the consulting room.

Separate an unwell cat's bowls and bedding from other cats until you have veterinary advice, wash your hands between cats and keep vaccinations current. These measures reduce spread but do not replace a diagnosis.