Cat Stomatitis: Causes, Symptoms & Treatment for Painful Mouth Disease

Last updated: May 6, 2026

If your cat has suddenly stopped eating, drools constantly, or screams when yawning, you may be dealing with one of the most painful conditions in feline medicine: cat stomatitis. Also called feline chronic gingivostomatitis (FCGS), this disease causes the tissues inside a cat’s mouth to become severely and persistently inflamed. Unlike a simple toothache or mild gum irritation, stomatitis involves a widespread immune overreaction that can affect the gums, the tissue lining the cheeks (buccal mucosa), the area behind the last teeth (caudal oral mucosa), the tongue, and even the throat. The pain is often so intense that cats stop grooming, refuse food, and lose significant weight before their owners realize something is seriously wrong.

This guide covers everything cat owners need to know about feline stomatitis — what causes it, how to recognize the symptoms, what your veterinarian will look for during diagnosis, and the full range of treatment options available, including the procedure that offers the highest cure rate: full mouth tooth extraction.

What Is Cat Stomatitis?

Cat stomatitis is a chronic, inflammatory condition of the oral cavity characterized by painful, red, swollen, and often ulcerated tissue inside the mouth. The term “stomatitis” literally means inflammation of the mouth, and in affected cats the inflammation is far more severe and persistent than what you would see with routine dental disease. While gingivitis — inflammation limited to the gum tissue directly around the teeth — is extremely common in cats, stomatitis extends well beyond the gum line to involve the cheeks, the back of the throat, and sometimes the tissue under the tongue.

Veterinary professionals often distinguish between two presentations. Alveolar mucositis involves inflammation of the tissue directly adjacent to the teeth. Caudal stomatitis, sometimes called caudal oral mucositis, affects the tissue at the back of the mouth near the throat and is generally considered more difficult to manage. Many cats present with both forms simultaneously. The affected tissue is typically bright red, may bleed easily when touched, and is often covered with proliferative or ulcerated lesions that are exquisitely painful.

Estimates suggest that cat stomatitis affects between 0.7 and 10 percent of the general feline population. It can develop at any age but is most commonly diagnosed in cats between three and ten years old. The condition is chronic and progressive — without intervention, it does not resolve on its own and typically worsens over time.

Causes of Cat Stomatitis

The exact cause of feline stomatitis is not fully understood, but decades of veterinary research point to an abnormal immune response as the central driver. Rather than a single identifiable pathogen or trigger, cat stomatitis appears to result from the immune system overreacting to bacterial plaque and other antigens in the oral environment. In a healthy cat, the immune system manages oral bacteria without excessive inflammation. In a cat with stomatitis, the immune system mounts an inappropriate, exaggerated inflammatory response that damages the cat’s own oral tissue.

Immune System Dysfunction

The immune-mediated nature of cat stomatitis is supported by the presence of high concentrations of inflammatory cells — particularly lymphocytes and plasma cells — in biopsy samples of affected tissue. This is why the condition is sometimes referred to as lymphocytic-plasmacytic stomatitis. The immune system essentially treats normal oral bacteria as a serious threat, generating chronic inflammation that never resolves. This overreaction is the reason that removing the teeth — and thereby removing the surfaces where plaque accumulates — is so effective as a treatment.

Feline Calicivirus (FCV)

Feline calicivirus has been detected in a very high percentage of cats with stomatitis — some studies report detection rates above 80 percent in affected cats compared to much lower rates in cats with healthy mouths. While calicivirus alone does not cause stomatitis, it appears to play a significant role in triggering or maintaining the abnormal immune response. The virus may alter the oral environment in ways that make the immune system more likely to overreact to plaque bacteria.

FIV and FeLV

Cats infected with feline immunodeficiency virus (FIV) or feline leukemia virus (FeLV) are at higher risk for developing stomatitis. Both viruses compromise the immune system, and FIV in particular has been associated with increased severity of oral inflammation. Not all FIV-positive or FeLV-positive cats develop stomatitis, and not all cats with stomatitis test positive for these retroviruses, but the association is well documented. Testing for FIV and FeLV is a standard part of the diagnostic workup when cat stomatitis is suspected.

Dental Disease and Bacterial Load

Cats with significant dental disease, including tooth resorption, periodontal disease, and heavy plaque and tartar accumulation, are more likely to develop stomatitis. The bacterial load on and around the teeth provides the antigenic stimulus that the immune system overreacts to. This is one reason dental hygiene matters — while good dental care cannot guarantee prevention, reducing plaque accumulation may lower the risk or slow progression in susceptible cats.

Symptoms of Cat Stomatitis

Cat stomatitis is intensely painful, and most of the symptoms an owner will observe at home are direct consequences of that pain. Cats are instinctive hiders of discomfort, so by the time symptoms are obvious enough for an owner to notice, the disease may already be advanced. Learning to recognize the early and subtle signs can make a meaningful difference in how quickly your cat receives treatment.

Drooling (ptyalism): One of the most common and noticeable symptoms. The drool may be clear or blood-tinged, and owners often find wet spots on bedding, furniture, or the cat’s chest and front paws. In severe cases, drool may have an extremely foul odor because of infected oral tissue.

Refusing to eat or difficulty eating: A cat with stomatitis may approach the food bowl eagerly — clearly hungry — but then pull away, cry out, or drop food from the mouth after trying to chew. Some cats will only eat soft food. Others stop eating altogether. This is often the symptom that prompts an owner to seek veterinary care.

Weight loss: Because eating is painful, affected cats frequently lose significant weight over weeks or months. Weight loss may be gradual enough that owners do not notice until the cat is visibly thin.

Pawing at the mouth or face: Cats with oral pain often paw at their mouths, rub their faces on objects, or shake their heads. Some cats will chatter their teeth or make unusual jaw movements as they try to cope with the discomfort.

Bad breath (halitosis): Stomatitis produces a distinctive, intensely foul oral odor that goes well beyond the mild “cat breath” most owners are accustomed to. The smell is caused by necrotic tissue, bacterial overgrowth, and chronic infection.

Poor coat condition: Cats groom themselves primarily with their tongues. When the mouth is painful, grooming decreases or stops entirely, leading to a matted, dull, or unkempt coat — especially noticeable in long-haired cats.

Behavioral changes: Affected cats may become withdrawn, irritable, or aggressive when their head or face is touched. They may hide more, play less, and show a general decline in activity. Some cats that were previously vocal become quiet; others vocalize more, particularly when eating or yawning.

If you notice any combination of these symptoms, schedule a veterinary examination as soon as possible. Cat stomatitis does not improve without treatment, and the longer it goes unaddressed, the more the cat suffers.

Diagnosis of Cat Stomatitis

Diagnosing cat stomatitis begins with a thorough oral examination, which often requires sedation or general anesthesia because the mouth is too painful for the cat to tolerate a full inspection while awake. Your veterinarian will look for the hallmark signs: bright red, swollen, and often ulcerated tissue extending beyond the gum line to the inner cheeks, the back of the mouth, and sometimes the underside of the tongue and the area around the throat.

Visual examination: The characteristic appearance of the inflamed tissue is usually strongly suggestive of stomatitis, but visual examination alone cannot confirm the diagnosis or rule out other conditions that can mimic its appearance.

Full-mouth dental radiographs: X-rays of the entire mouth are essential. They reveal tooth resorption — a condition extremely common in cats with stomatitis — as well as root fragments, abscesses, and the overall condition of the teeth and bone. Dental radiographs directly influence the treatment plan, particularly when extraction is being considered.

Biopsy: A tissue biopsy is recommended to confirm the diagnosis and to rule out oral cancers, particularly squamous cell carcinoma, which can present with similar-looking lesions. Histopathology typically shows a dense infiltrate of lymphocytes and plasma cells, confirming the immune-mediated nature of the inflammation.

Blood work: A complete blood count and chemistry panel assess overall health and screen for underlying conditions. FIV and FeLV testing is performed if the cat’s retrovirus status is unknown. Elevated globulin levels on blood work can support a diagnosis of chronic immune-mediated inflammation.

Bacterial and viral testing: In some cases, cultures or PCR testing for feline calicivirus and other pathogens may be performed, particularly if the cat does not respond as expected to standard treatment.

Treatment Options for Cat Stomatitis

Treatment for cat stomatitis ranges from medical management to surgical intervention. The approach your veterinarian recommends will depend on the severity of the disease, the cat’s overall health, and how the cat responds to initial therapies. It is important to understand upfront that medical management alone often provides only temporary or partial relief. For many cats, surgery is ultimately necessary to achieve lasting comfort.

Professional Dental Cleaning

A thorough dental cleaning under general anesthesia is almost always the first step. Scaling and polishing remove plaque and tartar from the tooth surfaces, reducing the bacterial load that triggers the immune response. However, in cats with true stomatitis — as opposed to simple gingivitis — professional cleaning alone rarely produces lasting improvement. The inflammation tends to return as plaque reaccumulates. Dental cleaning is still valuable as part of a comprehensive treatment plan, and it allows the veterinarian to assess each tooth and take radiographs to plan further treatment.

Antibiotics

Antibiotics are frequently prescribed to manage secondary bacterial infections that develop in the damaged oral tissue. Commonly used antibiotics include clindamycin, amoxicillin-clavulanate, and metronidazole. Antibiotics can reduce pain and inflammation in the short term by bringing bacterial overgrowth under control, and many cats show noticeable improvement while on them. However, the improvement is typically temporary — symptoms return once the antibiotic course ends because the underlying immune dysfunction has not been addressed. Long-term or repeated antibiotic use raises concerns about resistance and is not considered a sustainable solution on its own.

Corticosteroids and Immunosuppressants

Because cat stomatitis is driven by an overactive immune response, medications that suppress immune function can provide relief. Corticosteroids — such as prednisolone — reduce inflammation and pain, often dramatically. Some cats respond well enough to steroids that their symptoms are manageable for extended periods. However, long-term steroid use carries significant side effects, including increased risk of diabetes, immunosuppression that leaves the cat vulnerable to infections, and potential worsening of any underlying viral disease. Cyclosporine is sometimes used as a steroid-sparing immunosuppressant, and some veterinarians have explored interferon therapy, though evidence for these alternatives remains limited.

The critical point is this: medical management can help manage symptoms, but it rarely cures cat stomatitis. For cats that do not respond adequately to medical therapy — and studies suggest this includes the majority — extraction surgery becomes the most important treatment option.

Full Mouth Tooth Extraction

Full mouth extraction (also called whole mouth extraction or radical extraction) is the gold standard treatment for severe or refractory cat stomatitis. The procedure involves removing all or nearly all of the teeth — either all teeth behind the canines (premolars and molars, known as partial or caudal extraction) or every tooth in the mouth (full extraction). Removing the teeth eliminates the surfaces where plaque bacteria accumulate, which removes the antigenic trigger for the immune overreaction.

The results are striking. Studies consistently report that approximately 60 to 80 percent of cats that undergo full mouth extraction experience complete resolution of their stomatitis or improvement significant enough that no further medication is needed. An additional 10 to 20 percent show substantial improvement with only minimal ongoing medical support. Only a small percentage of cats — roughly 10 to 15 percent — fail to improve meaningfully after extraction, and these cats may require continued immunosuppressive therapy.

Full mouth extraction is a lengthy surgical procedure — often lasting two to three hours — and must be performed by a veterinarian experienced in feline dentistry. Complete removal of every root and root fragment is essential, because retained root tips can serve as ongoing plaque-accumulation sites and prevent healing. Post-operative dental radiographs confirm that all roots have been fully removed.

Living After Full Mouth Extraction

One of the most common concerns cat owners have about full mouth extraction is how their cat will eat without teeth. The answer is reassuring: cats do remarkably well without teeth. In fact, most owners report that their cat eats better after extraction than before — because the cat is finally free from the excruciating pain that made eating a daily ordeal.

Cats do not chew their food the way humans do. Their jaw structure is designed primarily for tearing, and most cats swallow kibble pieces with minimal chewing even when they have a full set of teeth. After full mouth extraction, the gums harden over the course of a few weeks and cats are able to eat both wet and dry food comfortably. Many toothless cats return to crunching dry kibble within a month of surgery.

The recovery period immediately after extraction typically lasts one to two weeks. During this time, your cat will eat softened food and receive pain medication and possibly antibiotics. Most cats begin eating within 24 to 48 hours of surgery — a testament to how much pain the stomatitis was causing. Within a few weeks, owners frequently report that their cat seems like a completely different animal: more active, more affectionate, grooming again, and finally gaining back the weight they had lost.

If you are considering adoption and are open to a cat who has had dental extractions, these animals often make wonderful, grateful companions. Visit our adoption page to see cats currently looking for homes.

Pain Management for Cats with Stomatitis

Pain control is a non-negotiable component of managing cat stomatitis at every stage — before, during, and after any procedure. Cats with stomatitis are in significant pain, and addressing that pain is both an ethical imperative and a practical one, because uncontrolled pain suppresses appetite, impairs immune function, and reduces the cat’s quality of life.

Buprenorphine is one of the most commonly used opioid pain medications for cats with oral pain. It can be administered transmucosally (absorbed through the gum tissue), which is particularly convenient because it does not require swallowing a pill — an important consideration for a cat whose mouth is severely inflamed.

Gabapentin is increasingly used for chronic pain management in cats, including stomatitis pain. It can help with neuropathic pain components and has the added benefit of mild sedation, which can reduce stress during veterinary visits.

Non-steroidal anti-inflammatory drugs (NSAIDs) such as meloxicam may be prescribed for short-term pain relief, though long-term NSAID use in cats requires careful monitoring of kidney function. Your veterinarian will weigh the benefits against the risks based on your individual cat’s health status.

Never give human pain medications — including acetaminophen (Tylenol) or ibuprofen (Advil) — to a cat. Both are toxic and potentially fatal to cats even in small doses.

Prognosis for Cats with Stomatitis

The prognosis for cat stomatitis depends heavily on the treatment path chosen and how completely the cat responds. With medical management alone, the prognosis is guarded — the disease is chronic, requires ongoing treatment, and tends to progress. Steroids and antibiotics can buy time and reduce suffering, but they rarely achieve a cure.

With full mouth extraction performed by an experienced veterinary dentist, the prognosis is significantly better. As noted, the majority of cats — roughly 60 to 80 percent — achieve complete or near-complete resolution. These cats go on to live normal, comfortable, pain-free lives without teeth and without ongoing medication. Even among the smaller percentage of cats that require some continued medical support after extraction, quality of life is typically much improved compared to pre-surgical baseline.

Cats that are FIV-positive or FeLV-positive may have a somewhat lower response rate to extraction, likely because their compromised immune systems are less able to normalize even after the plaque trigger is removed. However, many retrovirus-positive cats still benefit enormously from the procedure, and their FIV or FeLV status alone is not a reason to withhold treatment.

The worst prognosis belongs to cats whose stomatitis is left entirely untreated. Without any intervention, the inflammation progresses, pain becomes unrelenting, the cat stops eating, and the decline in quality of life can become severe enough that humane euthanasia must be considered. Early, aggressive treatment — particularly extraction when indicated — offers the best chance for a long, comfortable life.

Breeds Affected by Cat Stomatitis

Cat stomatitis can affect any breed and any mix, including domestic shorthairs and domestic longhairs. However, certain purebred cats appear to have a higher incidence, suggesting a possible genetic component to immune susceptibility.

Siamese and Siamese-derived breeds — including Himalayans, Balinese, and Oriental Shorthairs — are frequently cited in veterinary literature as being overrepresented among stomatitis cases. Abyssinians, Persians, and Somalis have also been reported at higher-than-average rates. Maine Coons and British Shorthairs appear in some clinical reports as well, though less consistently.

Breed predisposition does not mean that a cat of a particular breed will develop stomatitis — it simply means the risk may be elevated. Similarly, mixed-breed cats develop stomatitis regularly, and the majority of diagnosed cases are in Domestic Shorthair cats simply because they represent the largest segment of the pet cat population. To learn more about individual breeds and their common health considerations, visit our cat breeds directory.

Frequently Asked Questions

Is cat stomatitis contagious to other cats?

Cat stomatitis itself is not contagious — it is an immune-mediated condition, not an infectious disease that can be passed directly from one cat to another. However, some of the underlying viral infections associated with stomatitis, particularly feline calicivirus and FIV, are contagious between cats. A cat with stomatitis driven in part by calicivirus can shed the virus to other cats in the household, though whether those cats also develop stomatitis depends on their own immune response. Good veterinary guidance on household management is important in multi-cat homes.

How much does full mouth extraction cost for a cat?

The cost of full mouth extraction varies widely depending on your geographic location, the veterinary clinic, whether a board-certified veterinary dentist performs the procedure, and the complexity of the individual case. As a general range, owners can expect costs between $1,500 and $5,000 or more. This typically includes pre-surgical blood work, general anesthesia, the extraction procedure itself, dental radiographs before and after extraction to confirm complete root removal, pain medications, and follow-up visits. While the cost is significant, the procedure offers the highest probability of long-term resolution and eliminates the ongoing expense of chronic medications that provide only partial relief.

Can cat stomatitis be cured without surgery?

In a small number of cases, particularly mild ones caught very early, aggressive medical management — including dental cleaning, antibiotics, immunosuppressive medications, and meticulous home care — can control symptoms adequately without extraction. However, the majority of cats with moderate to severe stomatitis do not achieve lasting remission with medical therapy alone. Studies consistently show that full mouth extraction produces better long-term outcomes than medical management. If your veterinarian recommends extraction, it is because the evidence strongly supports it as the most effective path to a pain-free life for your cat.

How long does recovery take after full mouth extraction?

Most cats begin eating soft food within one to two days after surgery. The initial healing period lasts about 10 to 14 days, during which the extraction sites close and the cat receives pain medication and possibly antibiotics. Full resolution of the stomatitis inflammation — the redness and swelling of the oral tissue — may take several weeks to several months after extraction as the immune system gradually calms down. Most owners see dramatic improvement in their cat’s comfort, appetite, and energy level within the first two to four weeks. A follow-up oral examination is typically scheduled four to six weeks after surgery to assess healing progress.

Can kittens get stomatitis?

Yes, though it is less common. Juvenile-onset stomatitis can develop in kittens as young as a few months old, sometimes coinciding with the eruption of permanent teeth. The presentation in kittens tends to be particularly aggressive, and early intervention — including extraction of the permanent teeth as they come in — may be necessary. Any kitten showing signs of oral pain, difficulty eating, or excessive drooling should be examined by a veterinarian promptly.

Should I brush my cat’s teeth if they have stomatitis?

If your cat has active stomatitis, attempting to brush the teeth is likely to cause severe pain and distress, and most cats with stomatitis will not tolerate it. Tooth brushing is far more valuable as a preventive measure in cats with healthy mouths. Once stomatitis is diagnosed, treatment decisions — including extraction — should be guided by your veterinarian. After full mouth extraction, there are no teeth left to brush, and the mouth typically heals to a healthy, comfortable state without the need for ongoing dental hygiene routines.