TL;DR: Green or yellow nasal discharge in cats typically indicates a bacterial infection requiring a veterinary exam within 24–48 hours, though difficulty breathing or loss of appetite requires immediate emergency care.
What does it mean if my cat has green nasal discharge?
When a cat experiences constant sneezing paired with thick green or yellow discharge, it is typically a sign of a secondary bacterial infection. While clear discharge can be related to simple allergies or mild viral irritation, colored mucus (purulent discharge) indicates that the body is fighting an active infection, often related to the feline upper respiratory infection complex, chronic rhinitis, or even a foreign body lodged in the nasal passage.
Is green nasal discharge in cats considered a medical emergency?
- Urgency Level: Medium.
- Schedule a veterinary evaluation within 24 to 48 hours if your cat is still eating and breathing comfortably.
- Seek immediate emergency care if your cat exhibits open-mouth breathing, extreme lethargy, or a complete loss of appetite.
How can a photo or video help my veterinarian triage my cat?
- Capture clear photos of the discharge and short videos of sneezing episodes to provide visual evidence of the symptoms.
- Provide these visuals to help the medical team, as cats often mask symptoms or have clean noses by the time they arrive at the clinic.
- Documenting the color, consistency, and frequency of the discharge helps your veterinarian determine the severity of the infection and the best course of treatment.
Clinical Context (Merck Veterinary Manual)
In cats, frequent sneezing with mucopurulent nasal discharge is often indicative of acute rhinitis complicated by secondary bacterial infection. Initial signs may include serous nasal and ocular discharge that progresses to mucopurulent discharge as inflammation increases, potentially becoming copious. Ulcerative stomatitis and keratitis may develop in severely debilitated cats. Treatment includes frequent removal of nasal and ocular discharges, nebulization or saline nose drops to loosen tenacious secretions, and antibiotics such as amoxicillin with clavulanic acid, cephalosporins, trimethoprim-sulfa, fluoroquinolones, tetracyclines, or chloramphenicol to combat bacterial invaders; tetracyclines and fluoroquinolones are particularly effective against _C. felis_ and _M. felis_. In some cases, nasal decongestants containing a vasoconstrictor (e.g., ephedrine sulfate) may be used short-term to reduce nasal exudate, and bland ophthalmic antibiotic ointments can prevent corneal irritation.
Chapter: Infectious Disease
Source: The Merck Veterinary Manual, 11th Edition (Page 1481)