Last updated: April 27, 2026

Stomatitis in Cats: Severe Mouth Inflammation Guide

Stomatitis in cats is one of the most painful conditions a cat can experience, and one of the most frustrating for owners and veterinarians alike. The term stomatitis means inflammation of the mouth, but in cats it refers specifically to a severe, chronic, often debilitating inflammation of the oral mucosa that goes far beyond ordinary gingivitis or dental disease. Cats with stomatitis may stop eating, lose weight, drool excessively, and withdraw from interaction — all because their mouths are so painful that even basic functions become agonizing.

Feline chronic gingivostomatitis (FCGS), as the condition is formally known, affects an estimated one to four percent of the cat population. While that may sound like a small number, it represents a significant caseload in veterinary practice and a condition with a major impact on quality of life for affected cats. The good news is that effective treatments exist, though they often involve decisions — particularly regarding tooth extraction — that can feel daunting for owners.

What Is Stomatitis in Cats?

Feline stomatitis is characterized by severe, chronic inflammation of the oral tissues, particularly the gingiva (gums), the alveolar mucosa (tissue lining the tooth sockets), and the caudal oral mucosa (the tissue in the back of the mouth, near the throat). The inflammation is not a primary disease but rather an exaggerated immune response, most commonly to the bacterial plaque on the tooth surfaces.

In a healthy cat, the immune system manages oral bacteria effectively, maintaining a stable balance between bacterial populations and immune surveillance. In cats with stomatitis, this balance is disrupted. The immune system mounts an inappropriately severe inflammatory response to normal oral bacteria and plaque, resulting in painful, proliferative, ulcerative inflammation that can affect the entire oral cavity.

The condition is distinct from periodontal disease, though the two often coexist. Periodontal disease involves the structures directly supporting the teeth (gums, periodontal ligament, alveolar bone). Stomatitis involves broader mucosal tissues and is fundamentally an immune-mediated condition rather than a purely infectious one. This distinction is important because it explains why antibiotics alone cannot resolve stomatitis — you cannot effectively treat an overactive immune response by targeting bacteria alone.

Causes of Stomatitis in Cats

The exact cause of feline stomatitis remains incompletely understood, but current evidence points to a multifactorial process involving immune dysregulation, viral infection, and dental plaque.

Immune dysregulation. The central mechanism appears to be an overactive or inappropriate immune response to oral antigens — primarily bacterial plaque. Affected cats produce excessive inflammatory mediators, including cytokines and immunoglobulins, in response to bacteria that healthy cats tolerate without issue. Why some cats develop this exaggerated response and others do not is not fully understood, but genetic factors likely play a role.

Viral infections. Feline calicivirus (FCV) is strongly associated with stomatitis — the virus is detected in the oral tissues of a large percentage of affected cats. Feline herpesvirus may also play a contributing role. These viruses may trigger or perpetuate the immune dysregulation that drives the inflammatory process. Feline immunodeficiency virus (FIV) and feline leukemia virus (FeLV) can increase susceptibility by compromising overall immune function, though stomatitis occurs in cats without these retroviruses as well.

Dental plaque. Bacterial plaque on tooth surfaces is the primary antigenic stimulus for the inflammatory response. This is the basis for the most effective treatment approach — removing the teeth eliminates the plaque-retaining surfaces and often resolves the inflammation. The specific bacterial species involved may differ from those in healthy cats, but it is the immune response to the bacteria, rather than the bacteria themselves, that drives the disease.

Other potential factors. Bartonella species, dietary antigens, and environmental factors have all been investigated as potential contributors. The role of Bartonella remains controversial, with some studies finding an association and others not. Stress may exacerbate symptoms by affecting immune function, particularly in multi-cat households.

Symptoms of Stomatitis in Cats

The symptoms of stomatitis reflect the severe pain and discomfort caused by widespread oral inflammation. Many owners first notice behavioral changes rather than directly observing the mouth.

Eating difficulties. Cats with stomatitis often approach the food bowl with enthusiasm — they are hungry — but then eat reluctantly, drop food from the mouth, chew on one side, or cry while eating. Some cats stop eating dry food entirely but continue with soft food. In severe cases, cats refuse all food. Weight loss is common and can be dramatic in cats that have been suffering for weeks or months.

Drooling. Excessive salivation (ptyalism) is a hallmark of stomatitis. The saliva may be thick, ropy, and sometimes blood-tinged. You may notice wet patches on the cat’s chin, chest, or bedding.

Bad breath. Halitosis in stomatitis cats is typically severe and has a distinctive, foul quality that differs from ordinary dental disease. The odor comes from the inflamed, ulcerated tissue and secondary bacterial overgrowth.

Behavioral changes. Pain causes cats to withdraw, hide, become irritable, or resist being touched around the head and face. Cats that previously enjoyed being petted may react aggressively when you approach their face. Grooming often decreases because the act of licking is painful, leading to a matted or unkempt coat. Some cats paw at their mouth or rub their face against objects.

Oral examination findings. If you can gently open your cat’s mouth (or the veterinarian does), the affected tissue appears intensely red, swollen, sometimes ulcerated, and may bleed easily on contact. The inflammation often concentrates at the caudal (back) portion of the mouth — the area where the upper and lower jaws meet (the fauces) — but can extend throughout the oral cavity. The tissue may have a cobblestone-like, proliferative appearance in chronic cases.

Diagnosis of Stomatitis in Cats

Diagnosis is based on clinical examination, but additional testing helps characterize the disease, identify contributing factors, and plan treatment.

Oral examination. A thorough oral examination, often requiring sedation due to the pain involved, reveals the pattern and severity of inflammation. The veterinarian will assess which tissues are affected — gingival only, caudal mucosal involvement, or generalized — as this helps guide treatment recommendations.

Dental radiographs. Full-mouth dental radiographs are essential for evaluating the teeth and bone. They reveal the extent of periodontal disease, tooth root pathology, retained roots from previous extractions, and tooth resorption (a common concurrent condition in cats). Dental radiographs are required for planning surgical treatment.

Biopsy. A biopsy of the affected tissue confirms the diagnosis histopathologically and rules out other conditions that can mimic stomatitis, including oral squamous cell carcinoma, eosinophilic granuloma complex, and lymphoma. Biopsy is recommended whenever the presentation is atypical or the diagnosis is uncertain.

Viral testing. Testing for FIV, FeLV, and feline calicivirus helps identify contributing factors and informs prognosis. FIV and FeLV testing requires a blood sample. FCV testing may be performed on oral swabs using PCR.

Blood work. Complete blood count and serum chemistry help assess overall health, identify concurrent conditions, and establish a baseline before treatment. Cats with chronic stomatitis may show elevated globulin levels (hyperglobulinemia) reflecting chronic immune stimulation.

Treatment of Stomatitis in Cats

Treatment of feline stomatitis is one of the areas where veterinary dentistry has made the most progress in recent decades. The single most effective treatment is tooth extraction, and this is an important concept for owners to understand.

Full-mouth or near-full-mouth extraction. Extraction of all premolars and molars (the teeth behind the canines) is the treatment of choice for feline stomatitis. The rationale is straightforward: removing the teeth eliminates the plaque-retaining surfaces that trigger the exaggerated immune response. Without teeth, there is no plaque accumulation, and the immune system’s primary stimulus for inflammation is removed.

The results are often dramatic. Studies consistently show that approximately 60 to 80 percent of cats achieve significant improvement or complete resolution after full-mouth or caudal (premolar/molar) extraction. An additional 10 to 20 percent show partial improvement requiring ongoing medical management. Only 5 to 10 percent of cats fail to improve despite extraction, and these cats often have particularly severe immune dysregulation or concurrent viral infections.

Many owners understandably hesitate at the idea of extracting their cat’s teeth. It is important to know that cats adapt remarkably well to life without premolars and molars. They eat wet food, dry food (by swallowing it whole or gumming it), and treats without difficulty. Most owners report that their cat’s quality of life improves dramatically after extraction — the relief from chronic pain far outweighs any inconvenience of missing teeth. The canine teeth and incisors may be left in place if the tissue surrounding them is not affected.

Medical management alone. Medical management without extraction is generally less effective and is usually considered a temporary or adjunctive measure rather than a definitive treatment. Options include immunosuppressive medications such as corticosteroids (prednisolone) or cyclosporine to reduce the immune response, pain management with buprenorphine or gabapentin, antibiotics for secondary bacterial infections, and dental cleanings to reduce plaque burden temporarily. The problem with long-term medical management alone is that the underlying cause — plaque-triggered immune dysregulation — is not addressed, and symptoms typically return when medications are reduced or discontinued. Long-term corticosteroid use carries significant side effects, including diabetes and immune suppression.

Newer therapies. Research is ongoing into newer treatment approaches. Mesenchymal stem cell therapy has shown promising results in early studies, with some cats achieving remission after stem cell infusions. Interferon therapy (feline recombinant interferon omega) may help some cats, particularly those with concurrent calicivirus infection. Laser ablation of inflamed tissue provides temporary relief but does not address the underlying cause. These therapies are generally considered for cats that do not respond adequately to extraction.

Prevention of Stomatitis in Cats

Because the exact triggers for the immune dysregulation underlying stomatitis are not fully understood, prevention in the traditional sense is limited. However, certain measures may reduce risk or delay onset in predisposed cats.

Dental hygiene. Regular dental care — including professional cleanings and, where tolerated, home tooth brushing — reduces plaque burden and may delay the onset of stomatitis in predisposed cats. Starting dental care early in life establishes good oral health habits and provides a baseline for monitoring changes.

Vaccination. Keeping vaccinations current, particularly against feline calicivirus, may reduce the severity of viral co-factors that contribute to stomatitis development.

Stress reduction. Maintaining a low-stress environment supports immune health. In multi-cat households, ensure adequate resources and space to minimize social stress.

Prompt treatment of dental disease. Addressing periodontal disease and tooth resorption promptly may reduce the chronic inflammatory burden in the oral cavity and delay the progression to full stomatitis in some cats.

Regular veterinary checkups. Annual oral examinations allow early detection of mucosal inflammation before it progresses to severe stomatitis. Early intervention — whether with improved dental hygiene or timely extraction — may produce better outcomes than treating advanced disease.

Prognosis for Cats with Stomatitis

The prognosis for stomatitis depends on the treatment approach and the individual cat’s response.

Cats that undergo full-mouth or caudal extraction have the best prognosis. Approximately 60 to 80 percent achieve complete resolution or significant improvement, often within weeks to months of surgery. These cats typically return to normal eating, grooming, and social behavior, and their quality of life is transformed. An additional 10 to 20 percent improve substantially but require intermittent medical management for residual inflammation. Only a small minority fail to respond to extraction.

Cats managed medically without extraction have a more guarded long-term prognosis. Symptoms tend to wax and wane, with periods of relative comfort alternating with painful flare-ups. Long-term medication use can lead to side effects, and the disease may become progressively more difficult to control over time.

Cats with concurrent FIV infection may have a more guarded prognosis, as their compromised immune systems may be less able to achieve the immune rebalancing that occurs after plaque-stimulus removal. However, many FIV-positive cats still respond well to extraction.

The most important message regarding prognosis is that stomatitis is a treatable condition. Cats do not need to suffer indefinitely. If your cat has been diagnosed with stomatitis, discuss extraction candidly with your veterinarian or a veterinary dental specialist. The procedure can be life-changing.

Frequently Asked Questions

Can cats eat after having all their teeth removed?

Yes. This is perhaps the most common concern owners have, and the answer is consistently reassuring. Cats adapt remarkably well to eating without teeth. Most cats eat both wet and dry food without difficulty. They may swallow dry kibble whole rather than chewing, but this causes no digestive issues. Many owners report that their cat eats with more enthusiasm after extraction than before — because the pain that was inhibiting eating has been eliminated. Cats are not dependent on their teeth for eating in the way that humans are.

Is stomatitis contagious between cats?

Stomatitis itself is not contagious — it is an immune-mediated condition specific to the affected cat. However, the viruses associated with stomatitis (particularly feline calicivirus) are contagious between cats. A cat with stomatitis may harbor calicivirus that could infect other cats, though the other cats would develop their own immune response and may or may not develop stomatitis depending on their individual susceptibility. Vaccination of all cats in the household helps reduce the risk of viral transmission.

How much does stomatitis treatment cost?

Full-mouth extraction for stomatitis typically costs between $1,500 and $5,000, depending on the geographic area, the number of teeth extracted, whether a veterinary dental specialist performs the procedure, and the extent of pre-surgical diagnostics. This includes anesthesia, dental radiographs, the extractions, pain management, and follow-up care. While this is a significant investment, it is typically a one-time cost that resolves the condition, compared to the ongoing expense of indefinite medical management including immunosuppressive drugs, pain medications, and repeated veterinary visits.

How long does it take for a cat to recover from tooth extraction?

Most cats recover from the surgical procedure within one to two weeks. Soft food is recommended for 10 to 14 days after surgery while the extraction sites heal. Most cats are eating comfortably within three to five days of surgery — often more comfortably than they were before, since the source of chronic pain has been removed. Full resolution of the mucosal inflammation may take several weeks to months after extraction as the immune response gradually normalizes.

Why did my cat get stomatitis?

The exact reason any individual cat develops stomatitis is usually not determinable. The condition results from a complex interaction between genetic predisposition, immune dysregulation, viral factors (particularly calicivirus), and oral plaque bacteria. Some breeds may be more prone than others, and cats that have spent time in shelter environments where viral exposure is high may be at increased risk. Stomatitis is not caused by anything the owner did or failed to do — it is a medical condition requiring veterinary treatment.

Can stomatitis come back after tooth extraction?

True recurrence after complete extraction is uncommon. In the 60 to 80 percent of cats that respond well to extraction, the improvement is typically long-lasting or permanent. In the subset of cats that retain residual inflammation after extraction, ongoing medical management can usually keep them comfortable. Rarely, if teeth roots were incompletely removed during surgery, inflammation may persist around retained root fragments — this can be identified with dental radiographs and addressed with revision surgery. Regular veterinary follow-up after extraction helps catch and manage any residual issues early.