Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Why Are My Cat’s Gums Red and Swollen? 8 Possible Reasons & What to Do

Share

Cat with red, swollen an inflamed gums or resorption of teeth in felines and gingivitis showing teeth

Owning a cat has its ups and downs, and unfortunately, most of the downs occur when our pets are sick.

When your cat has dental issues, it can sometimes indicate an underlying health problem. Either way, dental complications can have serious ramifications for their overall health.

If your cat has red and swollen gums, read on as we cover the different causes and the steps that you’ll need to take to ensure that your cat is safe and healthy.

divider 3 paws

The 8 Possible Reasons Why Your Cat’s Gums Are Red and Swollen

1. Gingivitis

Gingivitis is one of the most common dental issues that show up as red and swollen gums. It’s an indication of inflammation in the gums, often caused by a buildup of plaque and associated bacteria along the gum line.

Signs of gingivitis include:
  • Red and swollen gums
  • Bad breath
  • Notable plaque on the teeth
It’s caused by a variety of things including:
  • Tooth crowding
  • Inadequate oral hygiene
  • Underlying illness
  • Certain viruses

Gingivitis can be mild to severe and will need professional treatment by a vet, particularly if it’s severe.


2. Periodontitis

Periodontal-Disease-in-Cats
You are free to use this image but we do require you to link back to Catster.com for credit

When gingivitis isn’t treated, it will advance to periodontitis, which is an irreversible condition.

The tissue between the gums and teeth is weakened by the bacteria and the inflammation from the body’s immune reaction. This leads to tooth loss and loose teeth, which is why taking care of your cat’s teeth is so critical, particularly if they have gingivitis!


3. Stomatitis

Stomatitis is a disease that causes painful and severe inflammation throughout the cat’s mouth.

The signs of stomatitis include::
  • Bad breath
  • Excessive drooling
  • Red, inflamed gums
  • Lack of grooming
  • Dropping food from the mouth
  • Crying while eating
  • Loss of appetite
  • Weight loss

The cause isn’t entirely known, but treatment can include a complete professional dental cleaning by your vet, as well as various medications. In some cases, tooth extraction might be necessary.

vet checking cats teeth
Image Credit: PRESSLAB, Shutterstock

4.  Toxins

Several toxins can cause a cat’s gums to become red.

Signs of cyanide poisoning, for example, might include:
  • Red gums
  • Vomiting
  • Panting
  • Difficulty breathing
  • Dilated pupils

A cat can become poisoned by cyanide by eating specific plants, pesticides, fertilizers, or apple seeds, leaves, or stems, though this is not commonly seen in cats.


5.  Underlying Condition

Several conditions can contribute to inflamed gums and lead to gingivitis. This includes feline immunodeficiency virus, feline leukemia virus, feline calicivirus, and kidney failure. A few of these conditions can also cause ulcerations on the tongue and gums.

close up examining cat's mouth with swollen gums
Image By: mojahata, Shutterstock

6.  Heatstroke

A cat suffering from heatstroke can have reddened gums. The normal body temperature for a cat is 99°F to 102.5°F (37–39°C), so if their core body temperature goes over this, they can potentially suffer from heatstroke.

Signs of heatstroke can include:
  • Reddened gums
  • Disorientation
  • Vomiting/diarrhea
  • Difficulty breathing
  • Panting and wheezing
  • Seizures
  • Collapse

Heat stroke is an emergency situation and requires medical help immediately!


7. Teething

Kittens go through teething twice: when their baby teeth come in and when their adult teeth come in.

Signs that your kitten is teething are:
  • Chewing on everything
  • Bad breath

Teething is perfectly normal, and you can buy toys made for teething kittens or freeze something like a damp and clean washcloth and let them chew it, as this can provide relief. You can also consult a vet for more tips to help your kitten through teething.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

8. Tooth Resorption

Tooth resorption occurs when a tooth breaks down and becomes absorbed by the body. This leads to tooth loss. The cause isn’t known, but cats are more likely to suffer from tooth resorption as they mature, and other teeth are often affected in the future.

Signs of tooth resorption are:
  • Difficulty chewing
  • Chattering jaw while eating
  • Dropping food while eating

Treatment might include extracting the affected teeth, but unfortunately, there isn’t any known way to prevent it. Some cats show no outward signs of suffering from tooth resorption, so annual physical exams are important to detect these types of dental issues.

divider 3 paws

What to Do to Keep Your Cat’s Teeth and Gums Healthy

Unfortunately, a few of the conditions on this list can’t be prevented, but many can. The most important thing that you can do for your cat is take care of their teeth.

  • Brush your cat’s teeth with a toothbrush and toothpaste made for cats. Don’t use anything but products for cats, as human toothpaste has ingredients that are toxic to felines. Brushing your cat’s teeth at least several times a week will keep their teeth and gums healthy and give you the opportunity to check their gums for any potential issues.
  • Invest in dental treats that your cat enjoys, as they will help prevent plaque and tartar buildup.
  • Take your cat to a vet annually. They can check your cat’s teeth and give them a professional dental cleaning under anesthesia.

divider 3 paws

Conclusion

Cats with red and swollen gums are often experiencing dental problems. Some are worse than others, but unless they’re teething, they will need a veterinarian’s attention. If you believe that your cat has gingivitis, it can likely be resolved with diligent at-home dental care under veterinary guidance.

Regularly checking your cat’s teeth and gums should help stop many problems before they start.


Featured Image Credit: Yaya Photos, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Ask Dr. Paola – Help! My Male Cat Gets Into Fights! (March 9, 2026)

Welcome to our “Ask Dr. Paola” series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our...

Why Your Cat’s Poop Smells Like a Biohazard

Nobody enjoys litter box duty, but sometimes it gets unbearable. The smell hits you from across the room. You’re scooping faster, lighting candles,...

RIP Your Furniture? Not With This Guide to Cat Scratch Damage Control

Your couch looks like it survived a minor apocalypse. The curtains have mysterious vertical shreds. That new rug you splurged on is already...

Celebrating 15 Years as the Most Popular Resident of No. 10 Downing Street

For almost 300 years, a rather unassuming Georgian building of black bricks with a shiny black door has been the official residence and...

More related

How to Handle the Post-Kitten Blues: 4 Cat Care Tips

Kittens are adorable little creatures. If you’re like most people, the process of taking care of a kitten (or an entire litter of...

Feliway Cat Diffuser Review in 2026: Recalls, Pros & Cons

Review Summary It can be upsetting for us humans to see our cats distressed or unhappy. Cats are sensitive creatures, so if you’ve...

New Era Veterinary Hospital: Heroes of the Pet World

Veterinarians, vet technicians, practice managers, rescuers, behaviorists, nutritionists, trainers, volunteers, and other animal professionals are the backbone of pet ownership. Helping pets and...

Inside the World of Cats Who Own Ice Cream Trucks

While searching Instagram for photos of things like cats destroying jigsaw puzzles, cats paying tribute to David Bowie, and cats who somehow resemble...

Keep reading

Is Your Cat Not Using the Litter Box? 6 Vet-Approved Causes

Is your cat not using the litter box? Use this checklist to see what problems are at play, as you need to take your cat to the vet. Most of these causes can be serious, and you should always suspect...

cat looking a pee on the floor

Can Cats Smell Other Cats on You? Does This Make Them Jealous?

Last weekend, when you went to that house party, and your friend’s cat curled up in your lap, did your cat give you one sniff when you got home and then shun you for the rest of the night? Are...

cat smelling woman's chin

Why is My Cat Breathing So Hard? 9 Vet-Approved Reasons & What to Do

Just like dogs, cats may breathe heavily and pant in certain circumstances. Because this behavior is much rarer in cats than in dogs, it is usually something to be worried about, especially if it persists for prolonged periods. Panting is...

close up white cat breathing

Why Is My Cat’s Third Eyelid Showing? 5 Vet Reviewed Reasons & Advice

Cats do not see the world in the same way that humans do. Their eye anatomy is different, and their eyes glow due to a reflective membrane at the back of their eyes that helps them see well in the...

Vet ophthalmologist examining a cat_s eyes with a slit lamp

Can Cats Eat Granola? Vet-Verified Nutritional Facts & Advice

Sometimes, for whatever reason, cats take a liking to human foods. This can be both cute and worrying at the same time. In the case of granola—which is made of oats—it isn’t dangerous in itself, but it is still best...

Can Cats Eat Granola

Why Do Cats Like Rubber Bands? 4 Vet-Approved Reasons

Cats are peculiar beings, and any cat owner knows that cats will entertain themselves with something simple, such as a milk ring, bottle cap, empty box, piece of paper, or even rubber bands. Even if you buy your cat plenty...

rubber bands_evondue_Pixabay

Why Do Cats Rub Their Faces on You? 3 Vet-Reviewed Reasons

A cat rubbing their face on you is one of the highest compliments you can receive from your furball, and it’s seriously adorable to boot. This behavior is called “bunting,” and it’s a common way cats greet their human companions,...

Gray cat licking owners face

Can Cats Eat Chocolate Cake? Vet Reviewed Facts & Safety Guide

The all-time favorite snack of most people, chocolate is an incredibly delicious treat made from cocoa beans. It is used in the food industry worldwide for making various specialties in the form of sweet desserts. If you are a pet...

Can Cats Eat Chocolate Cake

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.