Stomatitis in Cats: Symptoms, Causes & UK Owner Guide

Stomatitis in cats, also called feline chronic gingivostomatitis (FCGS), is a severe and painful inflammation of the soft tissues inside the mouth. It is frequently linked to feline calicivirus (FCV) and shows up as drooling, mouth ulcers, bad breath, and reluctance to eat. It needs veterinary diagnosis and long-term management, because the inflammation can persist for months or years.

If you are a UK cat owner watching your cat struggle to eat or wince when yawning, this guide explains the signs, the likely causes, and the options your veterinarian may discuss.

A cat resting comfortably at home.

What is stomatitis in cats?

Stomatitis in cats is a widespread, often severe inflammation of the mouth's soft tissues, including the gums, cheeks, and the area at the back of the throat. When the condition is long-lasting and affects the gums and wider oral cavity, veterinarians call it feline chronic gingivostomatitis (FCGS).

Unlike ordinary dental disease, which tends to stay near the teeth, feline stomatitis produces raw, red, and sometimes ulcerated tissue that spreads across large areas of the mouth. The immune system appears to overreact to material on the tooth surface and to certain viruses, driving relentless inflammation.

This is not a mild condition. Affected cats are frequently in significant discomfort, and the pain shapes almost every symptom owners notice.

What are the symptoms of stomatitis in cats?

The main symptoms of stomatitis in cats are drooling, bad breath, mouth ulcers, bleeding gums, and pain when eating or grooming. Many cats also lose weight because chewing hurts, and some paw at the mouth or cry out when they yawn.

Common signs UK owners report include:

• Excessive drooling, sometimes tinged with blood

• Strong, foul breath (halitosis)

• Red, swollen, or ulcerated gums and cheeks

• Difficulty eating, dropping food, or preferring soft food

• Weight loss and a dull, unkempt coat from reduced grooming

• Pawing at the mouth or flinching when the face is touched

• Hiding, irritability, or reduced appetite

Because these signs overlap with other oral diseases, a swollen, ulcerated mouth always warrants a veterinary examination. You can read more about why the pain is so intense in this companion article on why the feline mouth hurts so much with stomatitis.

What causes feline stomatitis?

Feline stomatitis is usually driven by an overactive immune response to plaque bacteria on the teeth, and it is strongly associated with feline calicivirus (FCV) in many chronic cases. Other contributing factors can include dental disease, other viral infections, and underlying immune conditions.

The leading theory is that the cat's immune system reacts excessively to normal oral bacteria and to viral triggers, producing severe and self-sustaining inflammation. This is why simply cleaning the teeth often does not resolve the problem on its own.

Contributing and associated factors include:

• Feline calicivirus (FCV), a common trigger in chronic cases

• Heavy dental plaque and periodontal disease

• Retained tooth roots or damaged teeth

• Underlying immune-related conditions

• Chronic stress, which can worsen flare-ups

Is feline chronic gingivostomatitis linked to calicivirus?

Yes, feline chronic gingivostomatitis (FCGS) is strongly linked to feline calicivirus (FCV), and many cats with chronic stomatitis test positive for the virus. FCV is a common respiratory and oral pathogen in cats, and its role in mouth ulcers and gum inflammation is well recognised.

FCV is a highly contagious virus that spreads through saliva, nasal secretions, and shared bowls or bedding, which is why multi-cat households and shelters see it so often. In some cats the infection clears, while in others it settles into a long-term pattern of oral inflammation and recurring sores.

If you want the full picture on this virus, our overview of feline calicivirus, its signs and spread explains how it moves between cats. UK owners specifically may also find the guide to calicivirus symptoms such as drooling, limping, and mouth sores helpful when comparing what they are seeing at home.

How is stomatitis in cats diagnosed?

Stomatitis in cats is diagnosed by a veterinary oral examination, often under sedation, combined with dental x-rays and sometimes a biopsy to rule out other causes. Your veterinarian may also test for feline calicivirus (FCV) and check for underlying immune conditions.

A thorough work-up matters because a raw, ulcerated mouth can have several causes, and the treatment plan depends on the diagnosis. Steps a vet typically follows include:

1. A full oral and dental examination, usually under sedation or anaesthesia

2. Dental x-rays to assess the tooth roots and hidden disease

3. Testing for FCV and other relevant infections

4. Blood tests to check overall health and screen for underlying conditions

5. A biopsy if anything looks unusual or does not fit the typical pattern

Never try to inspect a painful mouth forcefully at home. It hurts the cat and risks a bite, so leave the detailed examination to your veterinary team.

How is stomatitis in cats treated?

Stomatitis in cats is treated with a combination of professional dental care, pain relief, and management of the underlying inflammation, and in FCV-linked cases an antiviral approach may be part of the plan. Because feline chronic gingivostomatitis (FCGS) is a long-term condition, treatment focuses on controlling flare-ups and keeping the cat comfortable rather than promising a quick fix.

Common elements of a treatment plan include:

• Professional scaling and, in many cases, removal of affected teeth to reduce the plaque surface that drives the immune reaction

• Pain relief and anti-inflammatory medication prescribed by your veterinarian

• Treatment of any secondary bacterial infection with antibiotics, which address bacteria and not the virus itself

• Antiviral treatment where feline calicivirus (FCV) is involved in the oral disease

• Good ongoing dental hygiene and stress reduction at home

For FCV-linked oral disease, CureFIP's FCV-positioned product line uses EIDD-1931, the active ingredient in the CaliciX line. The EIDD-1931 Oral Capsules are listed at €69.00 and are dosed by body weight under veterinary supervision.

EIDD-1931 Oral Capsules at a glance

Detail	EIDD-1931 Oral Capsules
Price	€69.00
Dose	1 capsule (15 mg) per 2.5 kg body weight, every 12 hours
Pack	60 capsules per bottle
Standard duration	60 days
Not suitable for	ocular or neurological cases, and cats not eating or defecating
Important safety note	EIDD-1931 is teratogenic, so it must not be used in pregnant or lactating queens

Only your veterinarian can decide whether an antiviral is appropriate for your cat and confirm the correct dose for your cat's exact weight. Do not adjust doses yourself, and always follow the plan your vet sets.

What do UK cat owners need to know about stomatitis?

UK cat owners should know that feline stomatitis is a manageable but long-term condition that needs early veterinary involvement, honest expectations, and consistent care at home. The sooner the pain and inflammation are addressed, the better most cats cope.

A few practical points for owners in the UK:

• Book a veterinary appointment promptly if you see drooling, mouth ulcers, or a reluctance to eat, because untreated stomatitis causes real suffering.

• Expect a plan built around dental treatment, pain control, and flare-up management rather than a single one-off treatment.

• In multi-cat homes, good hygiene with separate bowls and clean bedding helps limit the spread of feline calicivirus (FCV).

• Keep vaccinations and routine health checks up to date, as advised by your veterinarian.

CureFIP is best known for its GS-441524 based work in feline health, and the wider network has supported more than 100,000 cats since 2019. That same commitment to precise, evidence-led care extends to how FCV-linked oral disease is approached with the CaliciX line. For a closer look at the virus behind many chronic cases, our detailed guide to calicivirus symptoms and the signs vets look for is a useful next read.

FAQ

Is stomatitis in cats painful?

Yes, stomatitis in cats is very painful, because the inflammation and ulcers affect large areas of sensitive mouth tissue. Many cats stop eating properly, drool, and become withdrawn, so prompt veterinary pain relief is important.

Can feline stomatitis be cured?

Feline chronic gingivostomatitis (FCGS) is generally a long-term condition that is managed rather than resolved overnight, and many cats improve markedly with dental treatment and appropriate medication. Your veterinarian will set realistic goals focused on comfort and controlling flare-ups.

Is stomatitis in cats contagious to other cats?

Stomatitis itself is not directly contagious, but feline calicivirus (FCV), which is linked to many chronic cases, spreads easily between cats through saliva and secretions. Separate bowls, clean bedding, and good hygiene help reduce transmission in multi-cat homes.

Does my cat need teeth removed for stomatitis?

Many cats with severe stomatitis benefit from removal of affected teeth, because this reduces the plaque surface that fuels the immune overreaction. Only your veterinarian, guided by an oral examination and dental x-rays, can decide what is right for your cat.

What should I feed a cat with stomatitis?

Soft, palatable food is usually easier for a cat with a painful mouth to eat, and warming it slightly can help release aroma and tempt a reluctant eater. Ask your veterinarian for specific dietary advice alongside pain relief and treatment.

If your cat is showing signs of stomatitis, the kindest next step is an early conversation with your veterinary team about diagnosis and comfort. To explore the FCV-focused options and understand how CureFIP approaches oral disease, speak with the CureFIP team or read more here and always confirm any treatment plan with your own vet.