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.

How to Tell If My Cat has a Fever: 10 Vet-Reviewed Signs

Share

man holding himalayan cat

For us, it’s easy to tell if we have a fever by feeling our foreheads or using a thermometer. Unfortunately, it’s not as simple as a pet parent when you think your cat is sick and might have a fever. It’s also important to note that the average temperature in cats isn’t the same as the normal temperature in humans. A cat’s normal temperature runs between 100.4 to 102.5 degrees Fahrenheit.

So, how can you tell when a cat has a fever? There are a few likely signs to watch for. In the guide below, we’ll discuss them and what you can do to reduce the fever.

divider cat paws oct 2024

When to Seek Vet Advice

If you suspect your cat is suffering from a fever or any sickness for a prolonged period, are concerned for their wellbeing, or simply want to discuss their health, you should contact a vet directly for an assessment. They can provide you with more information, advice, and a care plan.

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

How to Tell If Your Cat Has A Fever

1. Lack of Interest in Playing/Normal Behavior

One of the most common signs that your cat is sick and has a fever is a lack of interest in playing or participating in everyday activities. If your cat’s behavior changes drastically, they could be sick, have a fever, and need to be seen by a vet.

While there are many reasons a cat might not be acting normal, this is one of the signs to be on the lookout for if you’re concerned that your cat might have a fever.


2. Lethargy

As with humans, a fever is your cat’s body’s way of fighting off an infection. Whether the infection is viral or bacterial, the body fights it by raising the cat’s internal body temperature by activating their immune system.

Having no energy and being lethargic are very common side effects of having a fever and are among the main signs that your cat has one and might need to see a vet as soon as possible.

tired sick cat lying on bed
Image Credit: Natata, Shutterstock

3. Lack of Appetite

While a lack of appetite is a sign of several conditions, it is a common sign of a fever. If you find that your cat is refusing food, it’s best to make an appointment with your vet for a diagnosis and to get to the root of the problem.

Cats sometimes have days where they don’t eat as much as on other days. However, if they refuse the food they usually love, it could be a cause concern.


4. Hiding or Staying Away from Others

As a pet parent, you already know that cats are, by nature, programmed to survive. So when they get sick, they go off on their own or hide from others so as not to be vulnerable to attack.

In the wild, cats are vulnerable to attack from larger predators when they are sick. If your cat is feeling bad, they may hide away from others until they’re feeling well again.

cat lying on the floor hiding behind the curtain
Image Credit: Mantikorra, Shutterstock

5. Grooming Decreases

Cats are very meticulous and clean animals, and if your cat stops grooming, something is wrong. Healthy cats can be seen grooming themselves quite often.

If you notice your cat isn’t grooming, make an appointment with your vet to diagnose a possible underlying condition. Cats don’t stop grooming themselves for no reason, and a fever will make them feel bad enough that they don’t feel like it.


6. Breathing Rapidly

A cat that is breathing rapidly is a cause for concern, and you need to contact your vet for an appointment right away. The same goes for panting. If your cat is panting or breathing rapidly, they could have a fever or an underlying condition requiring quick medical attention.

If you can’t get in touch with your vet right away, it’s best to take your cat to the emergency vet clinic instead, especially if your cat is mouth-breathing.

a tabby cat panting on hot weather
Image Credit: Sari ONeal, Shutterstock

7. Shivering & Chills

Like humans, a cat that is shivering or has chills likely has a fever. It is a telltale sign that your cat is sick, and you need to take them to the veterinary clinic.


8. Rapid Heart Rate

A rapid heart rate and rapid breathing go hand in hand with a cat having a fever. A cat’s resting heart rate isn’t the same as a human’s; their heart rate should be between 120 to 160 beats a minute.

A fever can cause their heart rate to increase. If your cat’s resting heart rate gets to 240 beats a minute, it’s time to get them to an emergency vet immediately.

yellow sad sick cat
Image Credit: Nikolay Bassov, Shutterstock

9. Drinking Less Often

Drinking water is as essential to a cat’s health as it is to a human. A fever can cause your cat to not only lose their appetite but to drink less often as well. Dehydration can easily and quickly set in, which can be dangerous for your pet.

Keep a close eye on your feline, and if they seem to be drinking fewer fluids, it’s time to contact a vet.


10. Temperature is 102.5 Degrees or Higher

digital thermometer showing a cat has a fever
Image Credit: Evgeniy Kalinovskiy, Shutterstock

One sign that your cat is sick with a fever is if the thermometer reads 102.5 degrees or higher when you check their temperature. A pediatric thermometer is the easiest way to check your cat’s temperature. The temperature should be taken in the rectum. If the cat’s temperature reaches over 106 degrees Fahrenheit, you must seek help immediately, as your cat’s organs can start shutting down at this high temperature.

These are just a few of the signs you’ll likely see if your cat has a temperature. In our guide below, we’ll give you a few causes of fevers in cats and a little bit on how to care for your feline friend as they recover.

divider cat paws oct 2024

Causes of Fever in Cats

There are a few different reasons your cat might be suffering from a fever.

We’ll list a few of them for you below:

  • Viral infections
  • Bacterial infections
  • Toxins or poisoning
  • Cancers or tumors
  • Injuries
  • A metabolic disorder
  • Fungal infections
  • Parasites
  • Environmental causes
  • Autoimmune disorders

These are the main causes of cat fevers. If you suspect your cat is suffering from a fever, you should contact your vet directly for an assessment. They can provide you with more information and a care plan.

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

How to Care for a Cat with a Fever

You should never give your cat medication for a fever. Cats don’t need to take human medicine since it can make them even sicker. In fact, you should never give medication to your pet without getting your vet’s approval.

If you discover or suspect that your cat has a fever, your vet will help you devise a treatment plan, including making sure that your cat doesn’t become dehydrated while it’s sick.

After the vet visit, the best thing you can do for your furry friend is to pamper them, let them sleep, and patiently wait for them to get better. Love also helps, so don’t forget to give your cat plenty as they recover!

divider cat paws oct 2024

Conclusion

This concludes our guide on how to tell if your cat has a fever. Remember, if your cat does have a fever, there could be several causes for the underlying illness they might have. It’s best to contact your vet to determine what the problem is and to get a treatment plan that works and will have your little feline friend feeling better in no time at all.

Related Reads:


Featured Image Credit: Suthin Saenontad, 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 Cat Suddenly Has Dandruff! (March 30, 2026)

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

Your Cat Keeps Vomiting After Eating: Here’s What’s Going On

Cats vomit. It’s one of the less glamorous facts of life with a feline, and most cat owners have cleaned up more than...

Ask Dr. Paola – Help! My Cat Gets Diarrhea from Wet Food! (March 23, 2026)

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

Cat Shampoo Alternatives That Are Already in Your House

If your cat has ever gotten into something disgusting and you’ve found yourself without cat shampoo, we’re here to help. Before you panic...

More related

Amsterdam’s Floating Cat Sanctuary: De Poezenboot (The Cat Boat)

If you’re like me, then you understand me when I say that there’s something about cats that is so irresistibly charming. These furry...

How to Treat Ringworm in Cats (6 Vet-Approved Tips)

Ringworm is a common fungal disease in mammals that can cause discomfort and irritation in cats. You can determine if your cat has...

How to Become a Cat Breeder: Vet-Reviewed Ethics & Standards Explained

Catster advocates for adopting before shopping, though we fully understand there are many reasons for seeking a breeder. So, we encourage it to...

Can Cats Drink Apple Juice? Vet-Reviewed Facts & Advice

Plenty of cats love to investigate glasses that have been left on the counter. Maybe they just want a drink of water—instead of...

Keep reading

Are Geraniums Poisonous to Cats? Vet-Verified Facts & Info

If you’re a cat lover who also loves plants, you already understand the importance of knowing which plants are toxic to your cat. Potted plants can be a lovely way to brighten up your home’s interior, but if you have...

Catster_Are Geraniums Poisonous to Cats

Can I Take My Cat to the Beach? 6 Vet-Reviewed Tips and FAQ

A fun day at the beach is the perfect way to spend an afternoon, and it’s common to see dog lovers with their furry friends on the beach running along the shoreline. We know that some beaches don’t allow dogs,...

woman and her cat in the beach

Nebelung Cat Health Problems: 6 Common Issues

Nebelung cats are still a relatively rare breed. They have a very long lifespan of up to 18 years. But because they have only been around since the 1980s, there still isn’t a lot known about their overall health and...

Catster_Health Problems of Nebelung Cat

Can Cats Eat Bread? Vet-Approved Facts & FAQ

Bread is a tasty treat that can be served in a variety of ways. During the pandemic, many people began experimenting with making their own bread at home due to shortages at grocery stores and bakeries, as well as to...

Can Cats Eat Bread

Why Does My Cat Cry When I Leave? Vet-Verified Reasons & Solutions

While cats are often considered not to be terribly interested in people, they’re actually sensitive, loving creatures that become deeply attached to those they share their lives with. Companion cats develop bonds with their people that resemble those formed between...

Cat meowing

Temptations Cat Treats Review of 2026: Recalls, Pros & Cons

Temptations Cat Treats: Review Summary A popular American cat treat, Temptations is manufactured by MARS, the same company that produces Whiskas, Greenies, Sheba, and Eukanuba. Temptations treats are genuinely loved by many cats and their owners. They’re an affordable treat,...

Temptations Cat Treats Review

Why Do Cats Hate Water? 5 Vet-Verified Possible Reasons

If you’ve ever tried to give your feline friend a bath, you might already know that your cat is not a fan of water. Most domestic cats don’t appreciate getting wet at all. It’s true that some breeds of domestic...

Persian cat bathing

Can Cats Eat Nectarines? Vet Approved Nutritional Facts & FAQ

It’s usually pretty adorable when a cat goes for a treat that you wouldn’t expect them to enjoy. Between fruits, vegetables, snacks, and yogurt, none of these things are a part of your cat’s natural diet, but that doesn’t seem...

Can Cats Eat Nectarines

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.