SYMPTOM
Sneezing (chronic or frequent)
Repeated bouts of sneezing that persist for weeks or recur regularly, sometimes producing nasal discharge or occurring in paroxysms.
Viral Upper Respiratory Infection
Feline herpesvirus-1 (FHV-1) establishes lifelong latent infection in the trigeminal ganglia and can reactivate, for example after stress. Reactivation can pass without signs, or bring back sneezing, nasal discharge and conjunctivitis. Feline calicivirus can also contribute to chronic upper respiratory signs, though it more commonly causes oral ulceration alongside respiratory signs.
Chronic Rhinosinusitis
Persistent or recurrent sneezing may reflect chronic inflammation of the nasal passages and sinuses, often developing as a long-term sequel to acute viral infection. Damage to the nasal turbinates and mucociliary apparatus creates conditions favourable for secondary bacterial infection. The ongoing inflammation appears to be maintained by the cat's own immune response, and recurrent sneezing episodes are common.
Allergic or Inflammatory
Chronic sneezing may in some cases reflect sensitivity to inhaled allergens such as dust, pollen, or household irritants. Allergic rhinitis in cats is less well characterised than in humans but may present with chronic sneezing, clear nasal discharge, and nasal irritation that follows seasonal or environmental patterns.
Nasal Foreign Body
A foreign object lodged in the nasal passage (such as a grass seed or plant material) can produce persistent unilateral sneezing, often with discharge from the affected nostril. The sneezing may be particularly intense initially and then settle into a chronic pattern as the foreign material becomes embedded in the nasal mucosa.
Nasal Neoplasia
Tumours within the nasal passages can produce chronic sneezing that may be accompanied by nasal discharge, sometimes blood-tinged. Lymphoma and carcinomas are the most common nasal tumours in cats. The sneezing from nasal tumours tends to be progressive and may eventually be accompanied by facial deformity or airflow obstruction.
Dental Disease
Severe dental disease, particularly involving the upper canine and premolar teeth, can create oronasal fistulae: communications between the oral cavity and the nasal passages. These fistulae allow food material, water, and oral bacteria to enter the nasal passages, producing chronic sneezing, nasal discharge, and secondary rhinitis.
Why timing matters
Early observation
When chronic sneezing first becomes apparent, it may present as an increase in the frequency of sneezing episodes compared to the cat's normal baseline, or as sneezing that persists beyond the expected duration of an acute upper respiratory infection. Early chronic sneezing may be intermittent, occurring in clusters separated by days or weeks of relative normalcy. The discharge produced may be clear or slightly cloudy, and the cat may otherwise appear well between episodes.
Later presentation
As the underlying process progresses, sneezing may become more frequent, more intense, and associated with thicker or coloured nasal discharge. The cat may show visible discomfort during sneezing episodes, with some cats producing blood-tinged discharge during particularly violent paroxysms. Chronic nasal congestion may affect appetite and breathing patterns, and the cat may become more withdrawn or less active during prolonged episodes.
The trajectory of chronic sneezing depends substantially on its cause. Chronic rhinosinusitis typically follows a relapsing-remitting course, with flare-ups alternating with periods of relative quiescence. Allergic causes may follow seasonal patterns. Foreign bodies tend to produce persistent unilateral signs that rarely resolve on their own. Neoplastic causes typically produce progressive signs that worsen over weeks to months, although signs such as nosebleeds can be intermittent at first, so a spell of improvement does not rule a tumour out.
Conditions commonly associated
Chronic Upper Respiratory Disease in Cats
Chronic rhinosinusitis is a frequent cause of persistent sneezing and nasal discharge in cats. It is associated with earlier feline herpesvirus infection, but viral DNA is found in only some affected cats and active viral replication is not seen. The inflammation appears to be maintained by the cat's own immune response, with secondary bacterial infection.
Feline Immunodeficiency Virus (FIV)
FIV-infected cats are predisposed to chronic and recurrent infections, which can include upper respiratory infections that cause ongoing sneezing, although with good management many infected cats have little illness.
Nasopharyngeal Polyps
Chronic sneezing is common with nasopharyngeal polyps as the growth irritates the respiratory passages.
Feline Herpesvirus (FHV-1)
Feline herpesvirus damages the nasal lining, triggering frequent sneezing during active infection.
Feline Calicivirus
Upper respiratory tract involvement produces sneezing and nasal irritation.
Aspergillosis (Nasal)
Irritation of the nasal lining from fungal plaques triggers repeated sneezing that persists rather than settling.
Cryptococcosis
Fungal infection of the nasal lining irritates the tissue, triggering persistent sneezing.
When to explore further
Sneezing that persists for more than two to three weeks following an apparent upper respiratory infection, or that recurs in a pattern with identifiable triggers, may suggest the establishment of a chronic process rather than a simple acute infection.
Unilateral nasal discharge accompanying the sneezing (discharge consistently from only one nostril) may suggest a localised cause such as a foreign body, dental disease, or nasal mass. Discharge that starts on one side and later involves both nostrils can also be seen with tumours or fungal infection.
Sneezing that produces blood-tinged discharge, particularly if the bleeding is recurrent or progressive, may suggest mucosal erosion, turbinate damage, or in some cases a mass lesion within the nasal passages.
Chronic sneezing accompanied by reduced appetite, weight loss, or progressive facial swelling may suggest a more significant underlying process that extends beyond simple chronic rhinitis.
Sneezing that has been progressively worsening over weeks to months may warrant further investigation to distinguish between inflammatory and neoplastic causes, even if there have been spells of improvement along the way.
Observing the pattern of sneezing over time (whether it is truly continuous or episodic, whether it correlates with identifiable stressors, and whether it involves one or both nostrils) can help characterise the underlying process. Noting the character of any associated nasal discharge (clear, cloudy, coloured, blood-tinged) and whether it changes during or between episodes provides additional useful context. Keeping a brief diary of episodes, their duration, and any apparent triggers can be valuable for building a longitudinal picture of the condition.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS