If Your Cat’s Nasal Congestion Won’t Go Away — Causes and Treatment Points for Chronic Rhinitis and Rhinosinusitis

RespiratoryDiseasesMeongsiljang Veterinary Advisory Board

Feline rhinosinusitis is a chronic respiratory condition in which the nasal passages and sinuses become inflamed, often due to infections such as feline herpesvirus or calicivirus. We’ve compiled a comprehensive guide covering symptoms, diagnosis, treatment, and home care, all based on veterinary expertise.

What Is Feline Rhinosinusitis?

A cat showing signs of rhinitis resting indoors

Feline rhinosinusitis is a respiratory condition characterized by simultaneous inflammation of the nasal mucosa (nasal cavity) and the surrounding air-filled sinuses. The most critical point to understand is that while it may initially resemble a simple cold, chronic cases are difficult to cure completely and may require lifelong management. If symptoms such as nasal discharge and sneezing persist for more than two weeks, it is essential to visit a veterinary clinic to determine the exact underlying cause.

Main Causes of Rhinosinusitis

The most common causes are respiratory viral infections, such as Feline Herpesvirus-1 and Calicivirus. Once infected, the virus remains latent in the nerve ganglia and can reactivate during periods of stress or immune suppression, leading to recurring symptoms. Bacterial secondary infections are often caused by Bordetella and Pasteurella. Less commonly, fungal infections, tooth root infections, foreign bodies, or tumors may be responsible.

Checklist of Key Symptoms Not to Miss

Runny nose: It often starts as clear discharge and can progress to thick, yellow or green mucus.

Sneezing: Frequent, paroxysmal sneezing is the most common symptom.

Nasal congestion and mouth breathing: In severe cases, pets may breathe through their mouths and experience a significant loss of appetite.

Tearing and eye discharge: Conjunctivitis frequently occurs alongside these symptoms.

Nasal crusting and debris: When the condition becomes chronic, hardened secretions may accumulate around the nose.

Close-up of a cat’s face showing symptoms of tearing and runny nose.

Seek Emergency Veterinary Care Immediately If You See These Symptoms

If your cat is breathing only through its mouth or if its gums turn blue, seek emergency veterinary care immediately. Other emergency signs include refusing to eat for more than 24 hours, severe eye swelling, or a cloudy, opaque cornea. Cats rely heavily on their sense of smell to stimulate appetite; therefore, severe nasal congestion can cause them to stop eating entirely and deteriorate rapidly.

How Is It Diagnosed?

Veterinarians first examine the nasal mucosa using a nasal speculum. Bacterial and fungal infections, particularly cryptococcosis, are identified through nasal discharge culture and cytology. While herpesvirus and calicivirus can be detected via PCR, most cats have already been exposed to these viruses, making it difficult to diagnose active disease based solely on test results. Therefore, veterinarians make a diagnosis by combining clinical signs with other test findings. If symptoms are localized to one nostril or are chronic, a CT scan or nasal endoscopy is essential to rule out tumors, foreign bodies, or tooth root infections.

How Is Treatment Conducted?

Viral: Antiviral medications (famciclovir) or L-lysine may be used as supportive treatments, but the efficacy of systemic antivirals has not yet been clearly proven. Therefore, the cornerstone of management is supportive care, including attentive nursing, proper nutrition, and fluid and electrolyte supplementation.

Secondary bacterial infection: Antibiotics are prescribed by a veterinarian based on culture results, with doxycycline being a common empirical choice.

Fungal: Antifungal medications are administered long-term for several weeks to months, and debridement of lesions is performed if necessary.

Foreign bodies/polyps: These are removed via endoscopy or surgery.

Nasal flushing: Saline is used to clear secretions and facilitate nasal breathing.

A cat undergoing a nasal examination at the veterinary clinic

Home Care Points

Maintain appropriate indoor humidity to prevent the nasal mucosa from drying out. It’s important to keep your cat’s appetite up by offering warm, strongly scented canned food. Since nasal congestion can impair their sense of smell and reduce their desire to eat, warming the food can help stimulate their appetite. Gently soften and remove nasal crusts using saline nasal drops. If you have multiple cats, temporarily isolate the infected cat to prevent transmission to others. Managing the environment to reduce stress is also key to preventing recurrence.

A cat resting comfortably next to an indoor humidifier

Extra Caution for Brachycephalic Cats

Brachycephalic breeds with flat faces, such as Persians, Himalayans, and Exotic Shorthairs, have unique facial and nasal structures that can hinder the proper drainage of secretions, potentially leading to prolonged symptoms. However, there is insufficient evidence to definitively conclude that brachycephalic breeds necessarily experience more severe progression of rhinosinusitis. Therefore, regardless of breed, if sneezing or nasal discharge persists or worsens over time, it is best to visit a veterinary clinic early in the course of symptoms to accurately identify the underlying cause.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can feline rhinitis be transmitted to humans?

The herpesvirus and calicivirus, which are the main causes of feline rhinitis, are cat-specific viruses and are not transmitted to humans. However, they can spread to other cats through direct contact or exposure to secretions.

Is it possible to achieve a complete cure?

Viral (herpes) rhinitis cannot be cured because the virus remains latent in the nerve ganglia, so treatment focuses on suppressing symptoms and minimizing recurrences. Bacterial and fungal rhinitis, on the other hand, can be cured by eliminating the underlying cause.

Can it be prevented with vaccinations?

Feline herpesvirus and calicivirus are included in the FVRCP combination vaccine. While vaccination doesn't completely prevent infection, it significantly reduces symptom severity and greatly lowers the risk of chronic disease. Please maintain regular vaccination schedules.

Does yellow nasal discharge always mean a bacterial infection?

Yellow or green nasal discharge can signal a secondary bacterial infection, but it doesn’t always mean one is present. Avoid giving antibiotics without a culture test, as this can lead to antibiotic resistance. Always consult your veterinarian for proper diagnosis and treatment.

How long does the treatment take?

Acute bacterial infections often improve within one to two weeks after starting antibiotics. Viral and chronic cases require treatment for several weeks or longer, and long-term management is essential to prevent recurrence.

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References

[1] Thiry E, Addie D, Belák S et al. Feline herpesvirus infection. ABCD guidelines on prevention and management. Journal of Feline Medicine and Surgery. 2009;11(7):547-555.

[2] Radford AD, Addie D, Belák S et al. Feline calicivirus infection. ABCD guidelines on prevention and management. Journal of Feline Medicine and Surgery. 2009;11(7):556-564.

[3] Maggs DJ. Update on pathogenesis, diagnosis, and treatment of feline herpesvirus type 1. Clinical Techniques in Small Animal Practice. 2005;20(2):94-101.

[4] Mitten RW. Rhinitis and sinusitis. In: Bonagura JD, Twedt DC, eds. Kirk's Current Veterinary Therapy XIV. Saunders Elsevier. 2009.

[5] Ettinger SJ, Feldman EC, Côté E. Textbook of Veterinary Internal Medicine, 8th Ed. Elsevier. 2017.