Cat Sneezing & Runny Nose: Cat Flu or Something Serious?

Is your cat sneezing and starting to have a runny nose? Don't panic immediately — but don't ignore it either. There's a big difference between normal sneezing and signs of a serious infection.

This is a practical guide to telling them apart and deciding when a vet visit is necessary.

Normal Sneezing vs Sneezing That Needs Attention

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Normal Sneezing (No Cause for Concern)

1–3 sneezes per day
Sneezing after smelling something strong (perfume, smoke)
No other accompanying symptoms
Cat is still eating, drinking, and active as usual
Resolves on its own within 1–2 days

Sneezing That Needs a Vet Check

Constant sneezing (5–10+ times in one session)
Lasting more than 2–3 days
Accompanied by nasal discharge (clear, yellow, or green)
Watery eyes or excessive eye discharge
Reduced appetite or refusing to eat
Cat appears lethargic or weak
Blood present in sneezes

Main Causes of Constant Sneezing in Cats

Upper Respiratory Infection (URI / "Cat Flu")

The most common cause. Mainly caused by Feline Herpesvirus (FHV-1) or Feline Calicivirus (FCV). Highly contagious between cats — especially in colony or shelter environments.

Symptoms: Sneezing, clear→yellow discharge, red/watery eyes, fever, refusing to eat

Treatment: Antiviral (famciclovir for herpes), antibiotics if secondary bacterial infection, supportive care

Bacterial Infection (Chlamydophila / Bordetella)

Often occurs as a secondary infection following a viral infection. Chlamydophila felis characteristically causes severe conjunctivitis (red, pus-filled eyes) along with sneezing.

Symptoms: Thick yellow-green nasal/eye discharge, conjunctivitis in one or both eyes

Treatment: Doxycycline or azithromycin antibiotics as prescribed by a vet

Foreign Body in the Nose

A blade of grass, small seed, or other fragment lodged in the nasal passage. Sneezing is usually sudden and very forceful, often only from one nostril, and won't improve on its own.

Key signs: Sudden violent sneezing, discharge from one side only, cat pawing at its nose

Treatment: Needs veterinary examination and removal — don't try to remove it yourself

Nasal Polyps / Tumour

Tissue growths in the nasal passage or throat. More common in older adult cats. Chronic sneezing that doesn't respond to standard treatment is an important warning sign.

Signs: Months of chronic sneezing, snoring-like breathing sounds, bloody sneezes, facial asymmetry

Treatment: Diagnostics (rhinoscopy, CT scan), surgical removal if polyps are found

Environmental Irritants & Allergies

Cigarette smoke, strong perfume, scented candles, litter dust, insecticide sprays — all can trigger sneezing. Sneezing usually stops once the irritant is removed.

Signs: Sneezing starts after exposure to a specific substance, no fever or systemic symptoms

Treatment: Identify and remove the irritant, ensure good room ventilation

Supportive Home Care (for Mild Cases)

For mild cat flu without complications, here's what you can do while monitoring the condition:

Clean the nose and eyes with a soft cloth dampened with warm water — don't let crusting build up as it can block breathing
Steam inhalation — bring your cat into the bathroom while you run a hot shower and let them inhale the steam for 10–15 minutes. This loosens mucus in the nasal passage.
Wet food — sick cats often refuse to eat because a blocked nose means they can't smell. Wet food is more aromatic and easier to eat.
Warm, comfortable environment — keep away from direct air conditioning, provide a warm and quiet bed.
Isolate from other cats — URIs are highly contagious; isolate the sick cat while symptoms persist.

Vaccination as Primary Prevention

The FVRCP vaccine (Feline Viral Rhinotracheitis, Calicivirus, Panleukopenia) protects against the two main causes of cat flu — herpesvirus and calicivirus. Fully vaccinated cats can still get infected, but symptoms are much milder and recovery is faster. The core vaccine series starts at 8 weeks, with annual boosters.

Cat Won't Stop Sneezing? Birawa Vet Can Come to You

No need to stress about taking a sick cat to the clinic. A Birawa Vet doctor can come to your home for examination, sample collection, and medication — your cat stays comfortable and you stay at ease.

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Frequently Asked Questions

Is it normal for a cat to sneeze occasionally?

Yes, occasional sneezing (1–3 times per day) is normal — possibly triggered by dust, perfume, or mild irritants. What's not normal is constant sneezing (more than 5–10 times in one session), or sneezing lasting more than 2–3 days, especially if accompanied by other symptoms like a runny nose, watery eyes, or reduced appetite.

What are the most common causes of constant sneezing in cats?

The most common causes: (1) Upper Respiratory Infection (URI) — "cat flu" most often caused by herpesvirus or calicivirus, (2) Secondary bacterial infection (Chlamydophila, Bordetella), (3) Foreign body in the nose (grass, seeds), (4) Nasal polyps or tumour, (5) Allergies or environmental irritants (cigarette smoke, perfume, dust). URI is highly contagious between cats.

Can cat flu spread to humans?

No. The viruses that cause cat flu (feline herpesvirus, feline calicivirus) are highly species-specific and cannot infect humans. However, cat flu is highly contagious between cats — through direct contact, nasal discharge/tears, or contaminated surfaces.

When should a sneezing cat be taken to the vet urgently?

See a vet immediately if: sneezing is accompanied by thick green or yellow discharge (sign of bacterial infection), sneezing with blood, your cat refuses to eat for more than 24 hours, your cat looks lethargic or has laboured breathing, or there is swelling around the face or nose. Kittens and senior cats are more vulnerable to dehydration and complications — don't delay.

Can cat flu resolve on its own?

Mild cases in vaccinated adult cats often improve within 7–10 days with supportive care (warm environment, wet food, steam inhalation). However, without treatment, secondary bacterial infections frequently develop and worsen the condition. Kittens, senior cats, or cats with underlying illness should be examined by a vet to avoid serious complications.