TL;DR: Green nasal discharge in cats typically indicates a secondary bacterial infection and requires veterinary care within 24 to 48 hours, though it becomes an emergency if the cat is struggling to breathe.
What does it mean if my cat has thick green nasal discharge?
Thick, green discharge from your cat's nose is technically known as mucopurulent discharge. Unlike clear fluid, which can be caused by simple irritation or allergies, green or yellow mucus typically indicates a secondary bacterial infection. This happens when the immune system sends white blood cells to the nasal passages to fight off an underlying issue, such as a viral infection (like Feline Calicivirus or Rhinotracheitis), a fungal infection, or even a foreign object stuck in the nose.
When is green nasal discharge in cats considered a veterinary emergency?
- Urgency Level: This condition is generally a Medium priority, requiring a veterinary appointment within 24 to 48 hours.
- Health Risks: Cats rely on their sense of smell to eat; a blocked nose can lead to a total loss of appetite, dehydration, or liver issues.
- Emergency Signs: Seek immediate emergency care if your cat is gasping for air, breathing with an open mouth, or has completely stopped eating.
How does taking a photo of my cat's symptoms help with veterinary triage?
- Visual Evidence: Discharge may be sneezed away or cleaned off by the cat before you reach the clinic, so a photo provides proof of the color, thickness, and volume.
- Diagnostic Location: A photo helps the vet determine if the discharge is in one nostril or both, which distinguishes between localized issues like polyps and systemic respiratory infections.
- Better Assessment: A clear, well-lit photo of the face and discharge serves as an invaluable tool for your veterinary team to prioritize your cat's care.
Clinical Context (Merck Veterinary Manual)
In cats, a green, thick nasal discharge can be caused by various factors, including foreign bodies, neoplasia, mycotic disease (such as cryptococcosis or aspergillosis), or secondary bacterial infections involving organisms like *C felis* and *M felis*. Acute unilateral nasal discharge suggests a foreign body, while chronic discharge, initially unilateral but becoming bilateral or changing in character to mucopurulent, serosanguineous, or hemorrhagic, suggests neoplasia or mycotic disease. Diagnosis involves history, physical examination, radiographs (especially CT), rhinoscopy, nasal biopsy, and deep nasal tissue culture. Serologic evaluation can aid in diagnosing cryptococcosis; however, for aspergillosis, seropositivity combined with culture identification is more suggestive of infection. Treatment may involve antibiotics effective against secondary bacterial invaders or specific organisms, and supportive care such as frequent removal of nasal and ocular discharges.
Chapter: Respiratory, Infectious Diseases, Neoplasia, Fungal
Source: The Merck Veterinary Manual, 11th Edition (Page 1489)