TL;DR: Discharge from only one nostril is usually not a life-threatening emergency but requires a veterinary exam within 24 to 48 hours to rule out foreign objects or infections. To assist with diagnosis, take a photo of the discharge before your cat cleans it away.
What does it mean if my cat has discharge from only one nostril?
Noticing discharge from only one of your cat's nostrils (unilateral) is a specific symptom that differs from common respiratory infections where both nostrils are typically affected. We understand how concerning it is to see your feline friend uncomfortable, but identifying this one-sided issue is a helpful first step in getting them the right care.
Is unilateral nasal discharge in cats a medical emergency?
The urgency level for unilateral nasal discharge is Medium. While it is usually not a life-threatening emergency, it will not resolve on its own and requires specific steps:
- Schedule a veterinary appointment within 24 to 48 hours for a thorough examination.
- Seek immediate emergency care if your cat is also experiencing severe lethargy, facial swelling, or labored breathing.
What are the common causes of one-sided nasal discharge in cats?
When discharge is localized to one side, veterinarians typically investigate specific triggers, including:
- A foreign object, such as a blade of grass, lodged in the nasal passage.
- A dental abscess where a tooth root infection has reached the sinus.
- Nasal polyps.
- Localized fungal infections.
- Nasal tumors, which are more common in senior cats.
Why should I take a photo or video of my cat's nasal discharge?
Because cats are fastidious groomers, they often lick away discharge before you arrive at the clinic. Capturing a high-quality photo or video provides your vet with vital diagnostic information:
- Helps identify the exact color (clear, yellow, or bloody) and consistency of the fluid.
- Allows the vet to observe subtle facial asymmetry or swelling that may not be apparent during the exam.
- Provides a record of the symptoms even if the cat has groomed themselves clean before the appointment.
Clinical Context (Merck Veterinary Manual)
An acute unilateral nasal discharge in a cat, possibly accompanied by pawing at the face, often suggests a nasal foreign body. However, a chronic nasal discharge that was initially unilateral but becomes bilateral, or changes in character from mucopurulent to serosanguineous or hemorrhagic, may indicate neoplastic or mycotic disease. Diagnostic procedures include a thorough history, physical examination, and advanced imaging such as CT scans. Rhinoscopy and nasal biopsy are crucial for definitive diagnosis, but should be performed after imaging to avoid misinterpreting iatrogenic changes. Differential diagnoses to consider include oronasal neoplasia, dental disease (oronasal fistula), and nasopharyngeal disease (foreign body or mass lesions). CBC, serum chemistry profile, and urinalysis should be performed to exclude concurrent systemic disease. If epistaxis is present, a coagulation profile including prothrombin time, partial thromboplastin time, and buccal mucosal bleeding time should be considered, in addition to a platelet count.
Chapter: Respiratory, Infectious Diseases, Neoplasia, Fungal
Source: The Merck Veterinary Manual, 11th Edition (Page 1489)