A nasopharyngeal polyp in a cat is a benign inflammatory mass, and in most cases it starts in the lining of the middle ear. It can grow through the Eustachian tube into the nasopharynx, the space at the back of the nose above the throat, where it can block airflow or interfere with swallowing. Some polyps also push through the eardrum into the ear canal. Signs depend on exactly where the mass sits, a veterinarian usually needs to examine the cat under sedation or anesthesia to confirm it, and surgical removal is the usual treatment. Regrowth is possible, particularly when part of the stalk or the middle-ear source is left behind.
Where the polyp forms and how it grows
The American College of Veterinary Surgeons (ACVS) describes these polyps as benign inflammatory masses that can appear in the nose, nasopharynx, middle ear, or external ear canal. Most arise from the middle-ear lining. From there, the mass may extend through the Eustachian tube into the throat, or through the eardrum into the ear canal. The location of the stalk, the point where the polyp is attached, is what determines which signs a cat shows and which treatment is realistic.
What causes them
No single cause has been established. ACVS states that the exact cause is unknown and that inflammation from infectious agents, such as respiratory viruses, is suspected. However, studies have not consistently identified an infectious agent, and antibiotics alone do not resolve the polyp. The Merck Veterinary Manual (updated February 2026) likewise says the cause is unclear and may relate to chronic inflammation.
The clearest proposed explanation comes from Cornell University College of Veterinary Medicine. James Flanders, DVM, associate professor of surgery there, said: “We believe that this type of polyp is caused by inflammatory changes secondary to infection with a respiratory virus.” That is an expert’s stated belief about how these polyps usually develop, not a proven cause for any individual cat. Because the other professional sources treat causation as unresolved, it is not accurate to say that a specific virus caused a particular cat’s polyp.
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Symptoms depend on location
Because the polyp can sit in several areas, signs vary. A mass that stays in the upper airway tends to cause respiratory signs, while one that extends into the ear causes ear signs. Many of these symptoms also occur with other upper-respiratory and ear conditions, so they cannot identify a polyp on their own.
Signs linked to the nose and throat
- Noisy or snorting breathing
- Sneezing
- Nasal discharge
- Difficulty swallowing
Signs linked to the ear
- Head shaking
- Head tilt
- Pawing at the ear
- Discharge from the ear
When to see a veterinarian
Book a veterinary visit for any persistent noisy breathing, ongoing nasal or ear discharge, or swallowing difficulty. Ear signs such as head tilt or repeated head shaking also warrant an exam, because they can point to a problem extending toward the inner ear. Do not start antibiotics or home remedies in the hope that the signs will pass. Antibiotics alone do not resolve these polyps, and no owner-applied product has been shown to treat or remove one.
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How the diagnosis is made
Diagnosis is a veterinary process, usually carried out in these steps:
- Examination. The veterinarian looks beneath the soft palate and examines the ear canal. A thorough exam often requires sedation or anesthesia, because the cat must be still and the back of the throat needs to be visible.
- Radiographs (X-rays). These can identify a soft-tissue mass, though they may not show its full extent.
- Endoscopy. This allows direct visualization of the nasopharynx and can show where the stalk attaches.
- CT or MRI. These imaging methods can show how far the growth extends, which matters for planning surgery.
- Biopsy and histopathology. Tissue examined under a microscope can confirm the diagnosis.
Not every cat needs every step. The veterinarian chooses the tests based on the signs and on what is needed to plan treatment.
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Treatment options
Surgical removal of as much of the polyp as possible is the common treatment. The surgeon’s choice depends on how accessible the stalk is and on whether the source in the middle ear has to be addressed. The three approaches below are described in ACVS and VCA Animal Hospitals client education material.
Traction removal
When the polyp can be reached and its stalk is accessible, it may be pulled out directly. This can improve signs, but if the stalk or middle-ear source remains, the polyp can return.
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Stalk removal
ACVS notes that removing the stalk helps reduce recurrence. Addressing the attachment point is therefore central to a durable result.
Ventral bulla osteotomy
ACVS describes ventral bulla osteotomy, a surgical opening of the bulla (the bony chamber of the middle ear), as an option for reaching the source. VCA describes it as a more extensive procedure with possible complications. Whether it is appropriate is a decision the veterinarian makes for the individual cat, based on imaging, the location and extent of the polyp, and the cat’s overall condition.
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Comparing the options
| Factor | Traction removal | Stalk removal | Ventral bulla osteotomy |
|---|---|---|---|
| Feasibility | Possible only when the polyp and stalk can be reached simply | Requires access to the attachment point | A more extensive surgical option, chosen case by case |
| Source addressed | Removes the visible mass; the stalk or middle-ear source may remain | Targets the attachment point | Gives access to the middle-ear source |
| Recurrence risk | Recurrence is possible, especially if the stalk or source remains; a numeric rate is not stated in the ACVS or Merck material | ACVS states that stalk removal helps reduce recurrence; a numeric rate is not stated | Not stated in the ACVS or VCA material |
| Complications | Not stated in the ACVS or VCA material | Not stated in the ACVS or VCA material | VCA describes possible complications; the specific complications are not listed |
No single procedure suits every cat. The choice depends on what the examination and imaging show.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Recurrence and follow-up
Recurrence is the main reason follow-up matters. A polyp that regrows often does so from a stalk or middle-ear source that was not fully addressed. Owners should report any return of the earlier signs, such as noisy breathing, nasal or ear discharge, or swallowing difficulty, to the veterinarian who performed the surgery.
How common these polyps are
ACVS reports that 13% to 24% of reported polyp cases are bilateral, meaning they occur on both sides. The ACVS page does not state the publication year or the underlying study details. This figure describes the proportion of reported cases with bilateral involvement, not how many cats in the general population have polyps. A current, dated incidence figure for all cats was not identified in the sources reviewed.
The 2002 peer-reviewed review indexed by PubMed remains useful background on treatment, but for current guidance on cause and management, the ACVS, Cornell, and Merck material above is the more up-to-date reference.
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