Feline Stomatitis: Why Your Cat's Mouth Is So Painful and What Actually Helps

A cat that drools, drops food, or yelps when it yawns is telling you something hurts. One of the most painful causes is feline chronic gingivostomatitis (FCGS), often just called stomatitis: a severe, long-lasting inflammation of the gums and the soft tissues at the back of the mouth. It is far more than ordinary gingivitis, and it rarely goes away without proper veterinary treatment.

What Is Stomatitis?

In a healthy mouth the gums are pale pink and hug the teeth neatly. In stomatitis, the gums, the tissue at the back of the throat (the fauces), and sometimes the tongue and cheeks become red, swollen, ulcerated and prone to bleeding. The inflammation is out of proportion to the plaque you can see on the teeth, which is a clue that the immune system is involved.

The condition is relatively uncommon in the general cat population, but it is a well-known problem in multi-cat households and shelters, and some breeds appear to be over-represented.

Signs to Watch For

• Drooling, sometimes blood-tinged
• Bad breath that is noticeably worse than usual
• Dropping food, chewing on one side, or approaching the bowl and then backing away
• Weight loss and a rough, unkempt coat, because painful cats stop grooming
• Pawing at the mouth or flinching when the face is touched
• Red, raw-looking gums, especially at the back of the mouth
• Becoming withdrawn or irritable

Cats hide pain well, so many owners only notice when the cat has already lost weight. If your cat is eating less, see a vet promptly; cats that stop eating can develop serious liver problems within days.

What Causes It?

No single cause has been proven. The current understanding is that stomatitis is an exaggerated immune reaction to the bacteria in plaque on the tooth surface. Other factors that have been linked to it include:

• Feline calicivirus, which is frequently found in affected cats
• Feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV)
• Other bacterial and viral infections
• Possible genetic susceptibility
• Stress and crowded living conditions

Because infection with FIV or FeLV can be involved, your vet will usually recommend testing for both when stomatitis is suspected.

How Vets Diagnose It

A conscious cat will rarely let anyone look properly inside a painful mouth. Diagnosis usually involves:

• A physical exam and a history of appetite and weight
• Blood tests and a urine test, especially in older cats
• Testing for FIV and FeLV
• Full-mouth dental X-rays under general anaesthetic, which show diseased roots and hidden problems under the gumline
• Sometimes a biopsy, to rule out other conditions such as oral tumours

The biopsy matters because other mouth diseases, including squamous cell carcinoma and eosinophilic granuloma complex, can look similar.

A veterinarian shows how stomatitis looks in the mouth and how it is treated.

Treatment: Why Extractions Are the Main Answer

Medicines can calm the mouth for a while, but the treatment with the best long-term results is removing the teeth that the inflamed tissue is reacting to. This sounds drastic, yet cats cope remarkably well without teeth. Many eat soft or even dry food comfortably afterwards.

• Full-mouth or near full-mouth extraction is the standard recommendation for severe cases. Studies report that a majority of cats are cured or much improved afterwards, though a minority still need ongoing medication.
• Partial extraction (removing the back teeth only) is sometimes tried first, but it more often needs to be followed by further surgery.
• Pain relief is part of every plan, both around the surgery and for any flare-ups.
• Anti-inflammatory and immune-modulating drugs may be used for cats that do not respond fully to surgery. These need vet supervision and monitoring.
• Antibiotics can give short-term relief, but they do not solve the underlying problem and should not be used on their own for months.

Be cautious about "natural remedies" sold online. A cat with a painful, ulcerated mouth needs a proper diagnosis and pain control. Delay only means more suffering and weight loss.

Recovery and Home Care

• Offer soft, warm, strongly scented food, such as a good-quality wet food, after surgery.
• Keep the cat indoors and calm while the gums heal, which takes around two weeks.
• Give all prescribed pain relief on schedule, even if the cat seems comfortable.
• Weigh your cat weekly on kitchen or baby scales. Steady weight is a good sign.
• Keep follow-up appointments, because the vet will want to recheck the mouth and sometimes repeat the X-rays.

A vet explains the signs of stomatitis and the treatment options for chronic mouth pain.

Can It Be Prevented?

Because the cause is not fully understood, there is no guaranteed way to prevent stomatitis. You can, however, lower the risk of the plaque problem that triggers it:

• Book regular dental checks, at least yearly, and more often for cats with a history of gum disease.
• Brush your cat's teeth with a pet toothpaste if they tolerate it. Never use human toothpaste.
• Keep vaccinations up to date, particularly against calicivirus.
• Keep stress low in multi-cat homes by giving each cat its own food, water, litter and resting spaces.

The Bottom Line

Stomatitis is painful, but it is treatable. If your cat drools, smells bad from the mouth, or struggles to eat, do not wait. Early diagnosis and, in most cases, dental extractions can give a cat that was miserable at every meal a comfortable life again.

This article is general information, not veterinary advice. Always consult your vet about any change in your cat's eating or mouth.