TL;DR: Green nasal discharge in cats typically indicates a bacterial or viral infection and requires a veterinary appointment within 24 to 48 hours. Seek immediate emergency care if your cat is struggling to breathe, is extremely lethargic, or has stopped eating.
What does it mean if my cat has green nasal discharge?
Green mucus, medically known as purulent discharge, is a strong indicator that your cat's immune system is battling an infection. While clear discharge might be related to simple allergies or environmental irritants, thick green or yellow mucus typically signifies a bacterial or viral infection. Common causes include Feline Upper Respiratory Infection (URI), chronic rhinitis, or even dental disease where an infection has traveled from the tooth roots into the nasal passages.
Is green nasal discharge in cats a medical emergency?
- The urgency level for green nasal discharge is Medium, requiring a veterinary appointment within 24 to 48 hours.
- Bacterial infections do not usually resolve on their own and often require prescription antibiotics.
- Seek immediate emergency care if the discharge is accompanied by open-mouth breathing, extreme lethargy, or if your cat has stopped eating entirely.
How does taking a photo of my cat’s nose help with triage?
- A photo helps professionals determine if the discharge is unilateral (one nostril) or bilateral (both nostrils), which helps differentiate between a localized issue like a foreign object or a systemic infection.
- It allows the vet to see the exact color and thickness of the mucus.
- It provides an objective baseline for your cat's condition before you even arrive at the clinic.
Clinical Context (Merck Veterinary Manual)
In cats, nasal discharge can be indicative of various underlying conditions. Acute rhinitis is characterized by nasal discharge, sneezing, pawing at the face, and respiratory stertor. Chronic rhinitis, often a sequela of acute viral infections, can result in mucopurulent nasal discharge, decreased airflow through the nostrils, coughing, and sneezing. A change in nasal discharge from mucopurulent to serosanguineous or hemorrhagic may suggest neoplastic or mycotic disease. Unilateral nasal discharge, especially if acute, can indicate a nasal foreign body. Mycotic rhinosinusitis, most commonly caused by Cryptococcus spp in cats, should be considered.
Chapter: Respiratory, Infectious Diseases, Neoplasia, Fungal
Source: The Merck Veterinary Manual, 11th Edition (Page 1489)