TL;DR: Green nasal discharge in cats usually indicates a bacterial or viral infection that requires a veterinary appointment within 24 to 48 hours. Seek immediate emergency care if your cat is struggling to breathe or stops eating.
What does it mean if my cat is sneezing green mucus?
When your cat sneezes and produces green discharge, it is often a sign of a secondary bacterial infection or a viral Upper Respiratory Infection (URI). While clear discharge might be related to simple irritants or allergies, the presence of thick, colored mucus suggests that your cat's immune system is actively fighting off an infection. Common causes include Feline Herpesvirus, Calicivirus, or even dental issues that have affected the nasal passages.
Is green nasal discharge in cats a veterinary emergency?
- This condition is classified as Medium urgency; you should schedule a veterinary appointment within 24 to 48 hours.
- Bacterial or viral infections rarely resolve without medical intervention such as antibiotics or supportive care.
- Seek immediate emergency veterinary attention if your cat stops eating entirely or is breathing with an open mouth.
How does providing a photo of my cat’s nasal discharge help with triage?
- A clear photo captures the exact color, consistency, and volume of mucus before your cat grooms it away.
- Visual evidence allows the medical team to more accurately determine the severity of the infection.
- Photos help the clinic prioritize your cat's appointment appropriately based on the clinical signs shown.
Clinical Context (Merck Veterinary Manual)
In cats, sneezing with green mucopurulent nasal discharge can be indicative of several underlying conditions. Feline viral rhinotracheitis (FVR), often complicated by secondary bacterial infections, can initially present with serous nasal discharge that quickly becomes mucopurulent. Chronic rhinosinusitis, a frequent sequela of acute viral infections, results in hyperplastic glandular and epithelial changes leading to increased mucus production. Other causes of chronic rhinitis include trauma, parasites (Cuterebra), foreign bodies, neoplasia, or mycotic infection (Cryptococcus, Aspergillus, Penicillium). Dental root abscesses extending into the maxillary recess can also cause rhinitis or sinusitis.
Chapter: Infectious Disease
Source: The Merck Veterinary Manual, 11th Edition (Page 1481)