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

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

Cat Logic: I’ll Sleep Anywhere But There (with Video)

Hi, I’m Dr. Karyn! Read my introduction to learn more about me and meet my five hilarious cats: Clutch, Cyril, Alex, Zelda, and...

How to Stop Your Cat from Over-Grooming: Vet Answer & Advice

Cats are fastidious self-groomers, which is their trademark trait that begins from an early age. Your cat will tend to clean their fur...

Why Does My Cat Have Diarrhea All of a Sudden? 6 Vet-Reviewed Reasons

When you’re a cat parent, you know that there will be one or two icky messes to clean up. Occasionally, these messes are...

Can Cats Eat Gummy Bears? Vet-Reviewed Nutritional Facts

Gummy bears are fun treats when you want to wind down after a long day. They’re chewy, sugary, and adorably tasty. If your...

More related

Kitty Horoscope: October Belongs to the Lovely Libra Cat

Astrological signs can tell us a lot about ourselves and how we function in the world. But does it just stop with people?...

Orange Scottish Fold Cat: Info, Pictures, Facts & History

Orange Scottish Fold cats are sweet and charming, and they are one of the more unique breeds in terms of their facial shaping,...

Can Loud Music Harm a Cat? Vet-Reviewed Info

Ears, unfortunately, don’t have the handy ability to shut. If you enjoy listening to loud music, you’re forcing your cats to endure it,...

Are Siberian Cats Hypoallergenic? Breed Facts & Allergy Tips

The Siberian cat, also known as the Siberian Forest Cat, is Russia’s national cat. This ancient breed has a dense, medium, or large...

Keep reading

Is Litter Deodorizer Safe for My Cat? Vet-Approved Facts & Sanitation Tips

One of the least enjoyable things about owning a cat is dealing with litter boxes and all the unpleasantness that comes with them. One of the most difficult-to-manage aspects of litter box care is reducing the odors that come from...

Catster_Is Litter Deodorizer Safe for Cats

Will My Cat Get Diarrhea After Changing Food? Vet-Approved Nutritional Transition Facts & Advice

There are many reasons you might decide to change your cat’s food. Maybe your vet recommends a special diet to address your kitty’s health, or your pet store has stopped carrying your cat’s favorite food. Unfortunately, you can’t suddenly stop...

siamese cat eating food from bowl at home

Is Aglaonema Toxic to Cats? Vet-Verified Houseplant Advice

House plants are a fantastic way to give your home some life, so much so that many people have taken up the role of plant parents, adorning their space with greenery. Aglaonema commutatum, also known as the Chinese evergreen plant,...

Catster_Is Aglaonema Toxic to Cats

Why Does My Cat Watch Me Shower? Feline Behavior Unveiled

Anyone who lives with cats knows that they are prone to some strange behaviors. For one reason or another, our cats exhibit many behaviors that don’t exactly make sense to us. However, that doesn’t mean that these behaviors aren’t absolutely...

cat staring at their owner in the bathtub

Can Cats Produce Tears? Vet Approved Facts

When you think of your cat being able to produce tears, what you really might be asking is can cats cry? After all, when we see a very emotional movie or have a tragic event happen to us in our...

close up of cat with eye discharge

6 Great Activities for Cats at the Beach & Vet-Reviewed Tips (With Pictures)

If you’re planning on taking a vacation or day trip to the beach, the idea of leaving your cat behind is difficult. While dogs are considered man’s best friend, that doesn’t mean our kitty cats aren’t as important. In fact,...

cat walking on the beach

11 Best Cat Foods for Nursing Mother Cats in 2025 – Reviews & Top Picks

Motherhood is a tough job for humans and animals. One of the hardest parts of the job is pregnancy and nursing. Not only is the mother responsible for feeding her babies, but she must feed herself enough to make milk...

Gray mother cat feeding kittens while taking a nap

How Do Vets Put Cats Down? Vet-Verified Facts & Info

There will always be the dreaded day we have to say goodbye to our beloved pets. There never seems to be a good way to go about that, and it never seems like the right moment. It’s something we all...

sad, bored or sick cat