# Brachycephalic Airway Syndrome in Cats: Signs and Surgery

Brachycephalic obstructive airway syndrome in cats is a set of upper airway problems that make breathing harder for flat-faced breeds like Persians and Himalayans. Signs range from noisy breathing at rest to open-mouth gasping, and surgery can correct some of the blockages. Many owners assume the snoring and snuffling are normal for the breed, which is exactly why the condition gets missed.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

## Quick Answer

- Flat-faced cats have shortened skulls, and the soft tissues inside the nose and throat do not shrink to match, so airflow gets blocked.
- Common signs include noisy breathing, snoring, mouth breathing, reduced play, and trouble eating or sleeping comfortably.
- Many owners and even some veterinarians dismiss these signs as "normal for a Persian," so the condition goes undiagnosed for years.
- Surgery to open the nostrils (stenotic nares correction) has shown good outcomes in cats, with no complications or breathing distress reported within a 9-month follow-up in one small case series [1].
- Weight control, low-stress handling, and avoiding heat and smoke reduce the workload on an already narrowed airway.

## What Is Brachycephalic Obstructive Airway Syndrome in Cats?

Brachycephalic obstructive airway syndrome, often shortened to BOAS, is a group of anatomical abnormalities in the upper respiratory tract that together cause some degree of airway obstruction [1]. In plain words, the cat's skull is short and wide, but the soft tissue inside (the nose folds, the soft palate, the throat tissues) is sized for a longer head. That extra tissue crowds the airway.

In dogs, this syndrome is well known and heavily studied. In cats, it is recognized far less often, even though the same basic problem exists. A 2026 study used barometric whole-body plethysmography, a non-invasive breathing test, to confirm that brachycephalic cats can be classified into high-grade and low-grade upper airway obstruction, with the high-grade group showing clear clinical signs on exam [2]. That matters because it confirms what many owners suspect: the noisy breathing is real, measurable, and not just a breed quirk.

The word "syndrome" is used because several things go wrong at once. The most common components in cats are narrowed nostrils (stenotic nares), a long soft palate, and thickened or collapsing tissues in the larynx and throat. Any one of these can cause problems. Together, they compound.

## Signs Owners Notice: Flat-Faced Cat Breathing Problems

The earliest signs are easy to miss because they develop gradually and owners get used to them.

**Noisy breathing at rest.** A Persian cat with noisy breathing is the classic presentation. You may hear snoring, snuffling, or a whistling sound even when the cat is awake and calm. Some cats sound congested all the time.

**Mouth breathing.** Cats should almost never breathe through an open mouth at rest. If your cat pants or gasps while sitting still, that is a serious sign. For a deeper look at what open-mouth breathing can mean, see [Why Is My Cat Breathing open-mouthed? Feline Asthma & Respiratory Crisis](/knowledge/veterinary-medicine/symptom-guides/why-is-my-cat-breathing-open-mouthed-feline-asthma-respiratory-crisis).

**Exercise intolerance.** Your cat may stop playing sooner than expected, avoid jumping, or seem "lazy." This is often the airway, not personality.

**Sleep problems.** Cats with BOAS may sleep with their neck extended, wake frequently, or snore loudly enough to disturb the household.

**Eating and swallowing changes.** A long soft palate can interfere with swallowing. Some cats eat slowly, drop food, or gag.

**Gastrointestinal signs.** Many brachycephalic animals also have reflux and vomiting, likely related to the pressure changes from struggling to breathe. A 2026 study of 27 brachycephalic cats tracked both respiratory and gastrointestinal signs before and after surgery, and owners reported changes in both categories [3].

**Eye and ear issues.** The flat face shape also affects tear drainage and ear canals. These are not airway problems, but they often appear in the same cats. If your cat has ear discharge or head tilt, see [Ear Polyps in Cats: Signs, Diagnosis, Surgery, and Recurrence](/knowledge/veterinary-medicine/clinical-methods/ear-polyps-in-cats).

## Causes and Risk Factors

The root cause is genetics. Brachycephalic cats are bred for a flat face, and that selection pressure also shortens the airway and compresses the soft tissues.

**Breeds most affected.** Persians, Himalayans, Exotic Shorthairs, and Burmese are the most commonly affected. Any cat with a flat face and short nose is at risk.

**Stenotic nares.** This is a common feature of BOAS [1]. In dogs, the narrowing usually comes from a deviated alar cartilage. In cats, the narrowing is mostly caused by a redundant skin fold where the nostril meets the lip [1]. A separate 2023 study proposed that feline stenotic nares also arise from an elongated dorsal lateral nasal cartilage, which is why surgical techniques differ between species [4].

**Long soft palate.** The soft palate extends past the tip of the epiglottis, so air has to push past extra tissue.

**Laryngeal changes.** The larynx can become swollen or inflamed, and in severe cases the upper airway may be obstructed by edema of the mucous membranes [5]. Laryngitis in cats can also result from infection, inhaled irritants, trauma, or excessive meowing, and it can accompany rhinotracheitis or calicivirus [5]. In a brachycephalic cat, any added laryngeal swelling makes an already narrow airway much worse.

**Weight.** Obesity does not cause BOAS, but it makes every breath harder. Fat deposits in the throat and chest reduce the space available for air movement.

**Heat, stress, and smoke.** These increase breathing effort and can tip a borderline cat into a crisis.

## How BOAS Is Diagnosed

Diagnosis starts with a physical exam. Your veterinarian will watch your cat breathe at rest, listen to the airway, and look at the nostrils. They may check how much air moves through each nostril by holding a cold mirror or a wisp of cotton near the nose.

**Sedated airway exam.** The most useful test is a visual exam of the throat and larynx under light sedation. This lets the veterinarian see the soft palate length, the laryngeal opening, and whether the tissues collapse inward on inhalation.

**Imaging.** X-rays of the skull and throat can show soft tissue crowding. CT is sometimes used, especially if the veterinarian suspects a mass or polyp. Intranasal inflammatory polyps are well known in cats and can cause obstruction, so they are always on the list of possibilities [6].

**Plethysmography.** Barometric whole-body plethysmography is a non-invasive test that measures breathing signals while the cat sits in a chamber [2]. It is not available everywhere, but it can help grade severity and track response to treatment.

**Blood work and heart check.** Chronic airway obstruction puts strain on the heart and can affect blood pressure. In dogs with BOAS, researchers have looked at blood pressure and the cardiac biomarker NT-proBNP to see whether the syndrome affects cardiovascular values [7]. Your veterinarian may recommend similar screening in cats, especially before anesthesia.

| Test | What It Shows | Notes |
|---|---|---|
| Physical exam | Noisy breathing, nostril size, effort | First step, no sedation |
| Sedated airway exam | Soft palate length, laryngeal collapse | Most informative single test |
| Skull and throat X-rays | Soft tissue crowding, masses | Quick, widely available |
| CT scan | Detailed anatomy, polyps, masses | Used when surgery is planned |
| Whole-body plethysmography | Objective breathing measurements | Grades severity, not everywhere [2] |
| Blood work and blood pressure | Heart strain, anesthesia safety | Recommended before surgery |

## Treatment Options for Brachycephalic Airway Cats

Treatment depends on which parts of the airway are blocked and how much the cat is affected.

### Medical Management

Mild cases can often be managed without surgery. This means keeping your cat at a healthy weight, using a harness instead of a neck collar, avoiding heat and stress, and keeping the home free of smoke and strong aerosols. Your veterinarian may prescribe medications for inflammation or infection if those are contributing. Any drug dose is calculated from your cat's weight and health status, so follow your veterinarian's instructions exactly.

### Brachycephalic Airway Surgery in Cats

Surgery is considered when a cat has significant obstruction, especially stenotic nares or a long soft palate. The goal is to widen the airway at the narrow points.

**Stenotic nares correction.** Several techniques exist. One 2023 report described a single pedicle advancement flap technique used in three brachycephalic cats with inspiratory obstruction. The main problem was nostril stenosis from redundant skin on the ventral floor of the nares. All three cats had positive outcomes, with no surgical complications and no episodes of respiratory distress within a 9-month follow-up [1].

**Bilateral wedge resection.** Another 2023 study described a novel approach in seven cats: full-thickness bilateral wedge resection of the dorsal lateral nasal cartilage. The authors proposed that feline stenotic nares come from an elongated dorsal lateral nasal cartilage, and removing the excess cartilage relieves the narrowing [4].

**Ala vestibuloplasty.** A 2026 study described this technique and reported long-term outcomes in 27 brachycephalic cats. Owners completed questionnaires about respiratory and gastrointestinal signs, sleep, activity, and eye, ear, and dental health before surgery and more than 6 months after. The study used a total clinical severity score to measure change [3].

**Soft palate surgery.** If the soft palate is too long, the veterinarian trims it. This is often done at the same time as nostril surgery.

**Laryngeal surgery.** Severe laryngeal collapse may need more advanced procedures. These carry higher risk and are usually reserved for cats with significant compromise.

Surgery in cats is less commonly performed than in dogs, and not every general practice does it. Ask for a referral to a veterinarian experienced with feline airway surgery.

## Recovery, Outlook, and Long-Term Management

Most cats recover well from nostril surgery. Swelling in the first days is normal, and your veterinarian will give you specific instructions about activity, eating, and monitoring. In the three-cat case series, no complications were reported and no breathing distress occurred within 9 months [1]. In the 27-cat vestibuloplasty study, owners reported outcomes more than 6 months after surgery using a structured questionnaire [3].

Long-term management matters as much as the surgery itself.

**Keep the weight down.** Even a pound or two makes a difference in a cat with a narrow airway.

**Use a harness.** A collar puts pressure on the throat and can worsen breathing.

**Control the environment.** Avoid heat, humidity extremes, smoke, dusty litter, and strong cleaning products.

**Manage stress.** Vet visits, car rides, and household changes can trigger heavy breathing. Ask your veterinarian about pre-visit calming options.

**Watch for progression.** BOAS can worsen over time, especially if other components like laryngeal collapse develop. Regular checkups help catch changes early.

**Know the emergency signs.** If your cat is breathing with an open mouth, has blue gums, or is collapsing, that is an emergency. See [Cat Difficulty Breathing: Emergency Signs and What to Do](/knowledge/veterinary-medicine/online-vet-and-care-costs/cat-difficulty-breathing-emergency).

## Prevention

You cannot prevent the genetics of a flat face, but you can reduce the chance of severe disease.

**Choose wisely when getting a cat.** If you are considering a brachycephalic breed, ask about the parents' breathing history. Breeders who screen for airway problems produce healthier kittens.

**Keep your cat lean from kittenhood.** Obesity is the single biggest modifiable factor.

**Address signs early.** Do not wait until your cat is gasping. Noisy breathing in a flat-faced cat deserves a veterinary visit, not a shrug.

**Avoid breeding affected cats.** If you breed brachycephalic cats, have them evaluated for BOAS before breeding.

## Limitations and When to Contact a Veterinarian

This article gives general information. Your cat's individual situation needs a veterinarian who can examine the airway directly.

**Contact your veterinarian the same day if:**
- Your cat is breathing with an open mouth at rest
- Breathing effort increases suddenly
- Your cat refuses food or cannot swallow comfortably
- You notice a new noise or a change in an existing one

**Go to an emergency clinic now if:**
- Gums or tongue look blue or gray
- Your cat is gasping, extending the neck, or collapsing
- Your cat cannot settle or lie down to rest

**Schedule a routine visit if:**
- Your cat snores or breathes noisily most of the time
- You have noticed reduced play or exercise tolerance
- Your cat has frequent vomiting or reflux along with breathing noise

## Frequently Asked Questions

### Is noisy breathing normal in Persian cats?

No. Persian cats are prone to brachycephalic obstructive airway syndrome, and persistent snoring, snuffling, or whistling means air is moving through a narrowed space. Some breeders and owners treat it as normal, but it is a sign of an anatomical problem. A veterinarian can assess how much the airway is affected.

### Can brachycephalic airway syndrome in cats be cured?

Surgery can correct specific blockages like stenotic nares and an overly long soft palate, and many cats improve significantly. It does not change the underlying skull shape, so some degree of risk remains. Weight control and environmental management continue to matter for life.

### At what age do signs usually appear?

Signs often start in the first year or two, but they can be subtle and worsen gradually. Some cats are not diagnosed until middle age or later, when the airway has narrowed further or other tissues have changed. Any age is a reasonable time to ask about an airway exam.

### Is surgery safe for cats with BOAS?

Nostril surgery in cats has been reported with positive outcomes and no complications in a small case series [1]. Risk depends on the cat's overall health, the specific procedures needed, and the anesthesia team. Your veterinarian will assess heart, lung, and blood work before recommending surgery.

### Do I need a specialist?

Not always. Many general veterinarians can diagnose BOAS and manage mild cases. Surgery is less commonly performed in cats than in dogs, so a referral to a veterinarian with feline airway surgery experience is reasonable. Ask your primary veterinarian for a recommendation.

### Can I manage my cat without surgery?

Yes, if signs are mild. Weight control, harness walking, stress reduction, and avoiding heat and irritants can keep a mildly affected cat comfortable. If your cat has open-mouth breathing, collapse, or significant exercise intolerance, medical management alone is usually not enough.

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## Related Articles

- [Cat Difficulty Breathing: Emergency Signs and What to Do](/knowledge/veterinary-medicine/online-vet-and-care-costs/cat-difficulty-breathing-emergency)
- [Ear Polyps in Cats: Signs, Diagnosis, Surgery, and Recurrence](/knowledge/veterinary-medicine/clinical-methods/ear-polyps-in-cats)
- [Cat Asthma: Signs, Diagnosis, and Long-Term Veterinary Management](/knowledge/veterinary-medicine/symptom-guides/cat-asthma)
- [Why Is My Cat Breathing open-mouthed? Feline Asthma & Respiratory Crisis](/knowledge/veterinary-medicine/symptom-guides/why-is-my-cat-breathing-open-mouthed-feline-asthma-respiratory-crisis)
- [Feline Horner Syndrome: Diagnosis and Management](/knowledge/veterinary-medicine/clinical-methods/feline-horner-syndrome-diagnosis-management)
- [Upper Respiratory Infection In Cats Symptoms](/knowledge/veterinary-medicine/symptom-guides/upper-respiratory-infection-in-cats-symptoms)
- [Noisy Breathing in Cats: Causes of Congested Sounds](/knowledge/veterinary-medicine/symptom-guides/cat-noisy-breathing-sounds)
- [Shallow Breathing in Cats: Causes and When It's an Emergency](/knowledge/veterinary-medicine/symptom-guides/shallow-breathing-cats-causes-emergency)
- [Laryngeal Paralysis in Cats: Symptoms, Meow Changes, Treatment](/knowledge/veterinary-medicine/symptom-guides/laryngeal-paralysis-in-cats)

## References

1. [Surgical correction of stenotic nares using a single pedicle advancement flap technique in three brachycephalic cats](https://pubmed.ncbi.nlm.nih.gov/37897212/). Veterinary medicine and science, 2023.
2. [Characterization of Brachycephalic Obstructive Airway Syndrome in Cats Using Barometric Whole-Body Plethysmography](https://pubmed.ncbi.nlm.nih.gov/41897936/). Animals : an open access journal from MDPI, 2026.
3. [Ala vestibuloplasty for treatment of feline brachycephalic syndrome: a description of the procedure and long-term outcomes in 27 cats](https://pubmed.ncbi.nlm.nih.gov/42332403/). Journal of feline medicine and surgery, 2026.
4. [A novel surgical approach for feline stenotic nares: Bilateral wedge resection of the dorsal lateral nasal cartilage in seven cases](https://pubmed.ncbi.nlm.nih.gov/37842865/). Veterinary medicine and science, 2023.
5. [Laryngeal Disorders in Cats - Cat Owners](https://www.merckvetmanual.com/cat-owners/lung-and-airway-disorders-of-cats/laryngeal-disorders-in-cats). Merck Veterinary Manual.
6. [Intranasal inflammatory polyps associated with brachycephalic obstructive airway syndrome in a pug dog](https://pubmed.ncbi.nlm.nih.gov/42095163/). The Canadian veterinary journal = La revue veterinaire canadienne, 2026.
7. [Evaluation of blood pressure and NT-proBNP in pugs with and without clinical signs of Brachycephalic Obstructive Airway Syndrome](https://pubmed.ncbi.nlm.nih.gov/36619949/). Frontiers in veterinary science, 2022.

## Further Reading

- [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners)
- [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information)
- [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)