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.

Cat Brain Tumors (Vet Answer): Signs, Diagnosis & When to Euthanize

Abyssinian cat at the reception at the vet

Making the decision when to say good-bye to a beloved pet is one of the hardest things we will go through as pet parents. We love our pets and wish they could be with us forever. Unfortunately, our pets will typically only live for a portion of how long a human family member will live.

One of the most compassionate decisions we can make as pet parents is the decision to pursue humane euthanasia. If your cat has been diagnosed, or suspected to have, a brain tumor, knowing when to make this decision can be difficult.

Below we’ll discuss what to look for, how this condition is diagnosed, and when to know if you should euthanize your cat.

divider single cat paw oct 2024

The Signs of a Brain Tumor In Cats

Knowing if your cat has a brain tumor may be difficult at first. Some cats will have absolutely no abnormal signs and then start to have seizures one day. Other cats may show subtle signs such as different sized pupils, tilting their head to one side, circling or head pressing. Oftentimes, these signs may not be obvious to owners. Cats like to sleep often during the day and may only exhibit these signs when no one is near-by. Or, they may not allow owners close enough to witness these abnormal signs.

The most noticeable sign of your cat having a brain tumor is the onset of seizures. These can occur infrequently and then become progressively more frequent as the tumor grows. Other times your cat may just start to have seizures out of nowhere that don’t stop once they start.

The reason(s) why your cat may seem to be completely fine one day and then start to seizure non-stop the next day is depending on where the tumor is growing. If the tumor is not causing any issues with areas of the brain that control motor function, balance, breathing and/or behavior, then your cat may have little to no abnormalities at first. Other times tumors may start to bleed and/or cause inflammation in the brain and this is why your cat starts to have seizures.

No matter when these events occur, keep in mind that once diagnosed, there is no way for your veterinarian to know exactly when the tumor started to grow. It may have just been there a few weeks, to months to even years, depending on the type of tumor and location.

veterinarian examining a bengal cat at the clinic
Image Credit: Pressmaster, Shutterstock

How Can a Brain Tumor Be Diagnosed?

The only way a brain tumor can be absolutely diagnosed is with advanced imaging such as an MRI or CT scan. An MRI is the preferred diagnostic tool for brain imaging.

Unfortunately in animals, these costs can prove to be too much for owners as they are paid out of pocket and not often covered by insurance as with humans. Therefore, your veterinarian may only be able to suspect your cat has a brain tumor, but without an MRI, they will never be able to say this with 100 percent certainty.

Radiographs, or X-rays, can only provide so much information. This test is not sensitive enough to diagnose brain tumors in many cases. If the tumor is completely encased within the brain, and has not started to invade any areas of the bony skull, an x-ray will not give any diagnostic information. An X-ray may provide a presumptive diagnosis of a brain tumor if the tumor has grown large enough to invade your cat’s skull, nose, eye’s and/or face.

Your veterinarian may strongly suspect a brain tumor if your cat has abnormalities on physical exam such as circling, head pressing, different sized pupils, abnormal facial nerve testing such as the ability to blink and see, etc. They may perform bloodwork but this may also be normal in cases where a brain tumor is present.

Please know that your veterinarian is doing the best they can when they give you their thoughts based on a physical exam, bloodwork, and potentially x-rays. They will not be able to tell you with 100 percent certainty if there is a brain tumor or not without an MRI or CT scan.

Quality of Life in Cats With a Brain Tumor

Your cat may or may not have a great quality of life with a brain tumor. Cats very rarely suffer from epilepsy. This means if your cat starts to have seizures, there’s very likely an underlying cause. Oftentimes, anti-seizure medications are not effective when there is a tumor. Or, the medications are only effective for a short period of time.

If your cat needs these medications, you will have to try and give them to your cat two or three times a day. Many cats won’t allow pills or any medications to be given to them. Chasing your cat and giving medications to them may cause more stress than they’re worth.

Some cats will stop eating with a brain tumor or have little to no appetite. Others may lose their vision, have difficulty walking and/or be running into furniture and other household objects. Brain tumors in cats may have very few treatment options, and most are incurable. Because of this, it’s important to recognize that cats with brain tumors will have progressively worse abnormal signs and discomfort.

All of the above things add to the quality of life of your cat. If your cat is not able to enjoy day to day activities such as eating, drinking, cuddling, playing and/or sleeping, then you may need to consider humane euthanasia. If your cat is having seizures frequently, this is also an indication that their quality of life has become poor.

Lazy and well-fed cat looking for food and not eat
Image Credit: Elena Kutepova, Shutterstock

How Can I Assess My Cats’ Quality of Life?

There are some good tools available for those who are struggling to know if their cats’ quality of life has decreased to the point where euthanasia should be considered. A few good online sources include one by Lap Of Love, and another by The Ohio State School of Veterinary Medicine. Both of these online questionnaires and assessments should be answered honestly by you and other members of the family. The score will help you be more objective when looking at your pets quality of life so you may potentially make the decision to move forward with euthanasia. When making the decision to pursue euthanasia, the love for our pets and the want to have them around for longer may overshadow our pets’ true underlying health and happiness. These assessments help us to focus on them, not the extreme emotions we may feel about losing them.

You can also make a calendar of good days and bad days, or create a ranking scale yourself or with the help of your veterinarian. If your cat has consistently more bad days than good, humane euthanasia should be considered.

Natural Death at Home

Frequently, we as veterinarians hear owners’ wishes that their pets just pass away peacefully at home. The unfortunate reality is that death in its natural form, is often not peaceful and can be very difficult to watch. In the case of a brain tumor, your cat may start to seizure and not stop until they pass. This may be minutes to hours of non-stop seizures. Your cat may become non-responsive and be lying there, unable to move or interact until their breathing stops. Your cat may have an abnormal heart rate and/or breathing as they pass, which can be uncomfortable for them and for you to watch.

While we all want to pass peacefully in our sleep, the reality is that this is rarely the case. Giving your cat a peaceful ending with euthanasia is one of the most compassionate decisions you can make as a pet parent. You can hold them, have the family be with them, and even have a veterinarian come to your home to provide the euthanasia service if you want. Your cat can be sedated beforehand so they don’t feel anything and are not stressed during the process.

tabby cat lying on a womans chest
Image Credit: Alek_B, Pixabay

divider 1 paws

Conclusion

Losing a beloved pet, whether they pass naturally or you pursue humane euthanasia, is an extremely difficult decision. In cases where a cat may have a brain tumor, making the decision to pursue euthanasia is often dependent on their day-to-day quality of life. Frequent seizures, difficulty, and/or inability to perform and/or enjoy normal daily activities may help you determine it’s time to say goodbye.

Brain tumors are often unable to be treated, and will only worsen with time. Making the difficult decision to pursue euthanasia will oftentimes give your cat the peaceful ending they deserve before they suffer from an often incurable disease.


Featured Image Credit: Nataly Mayak, 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

7 Vet-Verified Abyssinian Cat Colors: An Overview (With Pictures)

Abyssinians are known to be affectionate cats that are easy to care for, but perhaps they are best known for their beautiful, uniquely...

Can Cats Make Babies Sick? 7 Vet-Reviewed Dangers & Safety Tips

If you are bringing a new bundle of joy home from the hospital soon, you might wonder how your feline family member will...

Can Cats Drink Oat Milk? Vet-Reviewed Facts & Safety Guide

While we try to lead more active lives and make smarter food choices, it’s sometimes easy to forget that the same considerations don’t...

Can I Get Worms From My Cat? Everything You Need to Know!

We love to have our cats close by for company and affection. But cat ownership has some downsides—like when they use their litter...

More related

Veterinary Appreciation Day 2025: When & How to Celebrate

Veterinarians do a lot for our pets. They make them feel better when they’re ill, keep them calm during appointments, and so much...

Can Cats Eat Daffodils? Vet-Approved Facts & FAQ

Since they’re a carnivore, a cat having a fascination with plants can be baffling to their owner. While eating some plants may not...

Are Forget-Me-Nots Toxic to Cats? Vet-Reviewed Houseplants Examined

If you’re a flower fanatic, you have undoubtedly seen and adored the lovely forget-me-not. Woodland forget-me-nots (Myosotis sylvatica) are a species of perennial...

10 Best Cat Coloring Books of 2025: Reviews & Top Picks

The world that we live in can be a stressful place. Our lives certainly have their ups and downs, so we need to...

Keep reading

Is Jasmine Poisonous to Cats? Vet-Reviewed Houseplants Examined

Most of us love the look of live houseplants and gorgeous, colorful gardens. However, many of these plants can pose an unexpected threat if we also own curious pets. Plenty of houseplants are toxic to cats, including some types of...

Catster_Are Jasmine Poisonous to Cats

Hookworms in Cats: Vet Reviewed Causes, Signs & Care

Your cat has just been diagnosed with hookworms, and you’re curious about where they got them, how you are supposed to care for your cat, and how to prevent them from getting hookworms again in the future. Well, hookworms are...

Abyssinian cat check by vet

How to Stop Cats From Fighting: 5 Vet-Reviewed Tips & Tricks

Intact cats are territorial and on the prowl for mates. You can curb aggressive You love your cats, and you’d love for them to get along with each other. Are catfights taking away from the peace and tranquility of your...

domestic-cats-fighting

Are Scottish Folds Hypoallergenic? Allergy Care Tips & Other Breeds

The Scottish Fold is an adorable cat species known for its folded ears. They are low-maintenance and love being around humans, making them great for families with kids. Scottish Folds are smart and caring, so they’re the perfect in-house pet....

grey scottish fold sleeping

How to Stimulate Your Cat’s Milk Production: 6 Vet-Approved Solutions

Nursing is a beautiful time for a new mother, and as your cat’s owner, you’ll find that it’s a wonderful thing to witness and be a part of. It can be stressful, though, and if you notice that your cat...

tabby mother cat feeding her kittens

Can Cats Eat Pumpkin Seeds? Vet-Reviewed Nutrition Facts & FAQ

Yes, most cats can eat pumpkin seeds without suffering any adverse effects. Pumpkin seeds are packed with nutrients that are extremely beneficial. What’s more, some cats seem to love the taste of these seeds. Therefore, do not be afraid to...

Can Cats Eat Pumpkin Seeds

Why Are My Cat’s Eyes Dilated? 5 Vet-Reviewed Reasons & What To Do

If you’re a cat owner, you’ve probably noticed that your cat’s eyes sometimes get wide and dilated, like those of Puss in Boots from the “Shrek” movies. Although the big kitten eyes (a.k.a. dilated pupils) are normal in most situations,...

Havana Brown cat

8 Types of Cat Food: Vet-Reviewed Nutrition Facts & Advice

Deciding what to feed your cat isn’t as simple as it used to be. The pet food industry is experiencing explosive growth, and new manufacturers are frequently entering the market. If you’re unsure where to begin, you’ve come to the...

top view of a cream maine coon cat eating dry and wet pet food from feeding dish