Nasopharyngeal stenosis in cats is a narrowing of the passage at the back of the nasal cavity that causes chronic stertor, open-mouth breathing, and exercise intolerance. It is often acquired after severe upper respiratory infection and responds well to balloon dilation or surgical repair when caught before secondary complications develop.
Last reviewed: June 2026
What Is Nasopharyngeal Stenosis in Cats?
Nasopharyngeal stenosis is an abnormal narrowing or complete membranous closure of the nasopharynx — the airway just behind the nasal passages where they join the throat. The acquired form is the most common: inflammation and scarring from severe or chronic upper respiratory infections (particularly feline herpesvirus), chronic regurgitation with nasal reflux, or prior surgery leave behind fibrous tissue that progressively obstructs airflow through the nose.
Cats are obligate nasal breathers, so even partial nasopharyngeal narrowing produces significant respiratory signs. A retrospective study of 21 cats comparing endoscopic and surgical treatment found no significant difference in success rates between approaches (11/12 endoscopic vs. 7/8 surgical), suggesting both techniques are viable when executed by experienced clinicians (Champetier et al., 2024, JFMS).
Signs of Nasopharyngeal Stenosis in Cats
Signs can develop gradually and are often initially attributed to chronic upper respiratory infection.
Common signs:
- Stertor — a persistent, low-pitched, snoring or rattling sound during breathing through the nose; often worse during sleep or rest
- Inspiratory difficulty — the cat struggles to draw air through the nose
- Nasal discharge — chronic mucopurulent discharge from one or both nostrils
- Sneezing — recurrent and not responsive to antibiotic courses
- Open-mouth breathing — in more severe cases the cat resorts to mouth breathing to compensate
- Exercise or excitement intolerance — brief activity causes exaggerated respiratory effort
- Gagging, dysphagia, or regurgitation — when the stenosis is severe
- Poor body condition and weight loss from reduced food intake
Acute decompensation:
- Respiratory distress — labored breathing, extended neck
- Cyanosis (blue gums) — life-threatening
Diagnosis and Treatment
Diagnosis: Advanced rhinoscopy or nasopharyngoscopy under general anesthesia directly visualizes the membranous stenosis. CT imaging is preferred to determine the extent and thickness of the stenosis before planning intervention. Plain skull radiographs may be normal and cannot reliably detect soft-tissue stenosis.
Treatment:
- Balloon dilation — an endoscopic balloon catheter is advanced to the stenotic site and inflated to fracture the fibrous membrane; multiple sessions may be needed as the scar can re-form; well-tolerated with excellent initial success rate in most cases
- Silicone stenting — a removable stent keeps the airway open during healing; achieves resolution in most cats
- Surgical resection (palatoplasty or flap repair) — an option for thick or complex stenoses; comparable success rates to endoscopic approaches
- Supportive care — humidification, short courses of anti-inflammatory medication, and nebulization can ease breathing temporarily but do not address the stenosis itself
The AAFP-AAHA Feline Life Stage Guidelines, 2021 recommend monitoring cats with a history of severe upper respiratory disease for persistent respiratory noise, as nasopharyngeal stenosis may develop weeks to months afterward.
When to See a Vet
Call your vet today if:
- Your cat makes a persistent snoring or rattling noise through the nose that has lasted more than two weeks
- Your cat has chronic nasal discharge that does not fully resolve between infections
- Your cat is breathing noticeably harder during mild activity or play
Go to the ER immediately if:
- Your cat is breathing with its mouth open and shows visible distress
- Your cat's gums look pale, grey, or blue
- Your cat is extending its neck and elbows outward and appears unable to catch its breath
What's going on with your pet?
Describe symptoms or snap a photo. Voyage tells you urgency, home care, and whether you need a vet.
First, tell us about your pet
Breed and age make a real difference in how Voyage interprets symptoms.
Describe the symptoms
Love it? See everything Voyage can do
Frequently Asked Questions
Can nasopharyngeal stenosis in cats resolve on its own? No. Fibrous nasopharyngeal stenosis does not resolve without intervention. The scar tissue that obstructs the airway is permanent until physically disrupted. Medical management with antibiotics or steroids can reduce secondary inflammation but does not remove the stenosis itself.
How many balloon dilation sessions will my cat need? Many cats require two to three sessions because scar tissue can re-form after initial dilation. Each session is performed under general anesthesia. Stent placement after dilation may reduce the need for repeat procedures by keeping the airway open during the healing phase.
How much does nasopharyngeal stenosis treatment cost? An initial exam and CT imaging run $600–1,400 combined. Rhinoscopy with balloon dilation under general anesthesia typically costs $1,000–2,500 per session. Surgical repair is similar or slightly higher, at $1,500–3,500. Repeat procedures add to the total, but most cats need only two to three sessions.
Is nasopharyngeal stenosis painful for cats? The stenosis itself may not cause overt pain, but the chronic effort of breathing through a narrowed airway is exhausting and stressful. Secondary rhinitis and sinusitis that develop from stagnant secretions can cause significant discomfort. Most cats show marked improvement in quality of life — calmer breathing, better appetite, increased activity — after successful treatment.
What is the long-term prognosis for cats with nasopharyngeal stenosis? Prognosis is good with appropriate treatment. Most cats achieve significant to complete resolution of stertor after one to three dilation sessions or surgical repair. Stenosis can recur, and periodic follow-up rhinoscopy may be recommended. Cats diagnosed and treated before severe secondary airway or sinus disease develops have the best outcomes.
Still Not Sure if Your Cat Needs a Vet?
When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of your cat's posture and nostrils or a short video clip so the stertor is audible, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.