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.

My Cat Has a Lump on Their Back Near The Spine, Is It Dangerous? Vet Approved Advice

Share

veterinarians examining a Maine Coon cat at a veterinary clinic

Every pet parent is familiar with the alarm of discovering a sudden change in their pet. It can be very scary to find a growth in their body, and our brains immediately jump to cancer since that’s a fairly common reason for new lumps. However, there can be several reasons that a cat can have a lump on it’s back near the spine, many of which are benign. You still want to get your cat checked out by a veterinarian because some conditions can have terrible consequences if you don’t deal with them quickly.

divider cats oct 2024

The 5 Causes Why Your Cat Has a Lump on Their Back Near the Spine

1. Cancerous or Non-cancerous Growth

Unfortunately, cancer is one of the most common diagnoses when your cat lumps on their back, especially if the lump is hard. However, cancer isn’t always the end. Your cat may have a positive prognosis depending on the type of cancer and how far it progressed before it was discovered.

Interestingly, 85% of cats with spinal lymphoma test positive for feline leukemia. The FeLV vaccine is designed to protect your cat against feline leukemia, and most veterinarians recommend it. Even so, the FeLV vaccine isn’t 100% effective.

Cats can also get lipomas, fatty growths near the spine or elsewhere in the body. They don’t require treatment and are unconcerning.

veterinarian holding the cat
Image Credit: H_Ko, Shutterstock

2. Spondylosis Deformans

Some cats develop bony growths. Spondylosis Deformans is benign and won’t cause permanent harm to your cat, but it might cause back pain.


3. Infection (Abscess)

A lump may form on an injury that hasn’t been treated properly. Your vet may prescribe antibiotics depending on the type of infection. Any injury should be treated as soon as possible to prevent infection, especially near the spinal cord since it’s closely connected to the brain.

Abyssinian cat at the reception at the vet
Image Credit: Nataly Mayak, Shutterstock

4. Injury

Your cat could have a lump on their back due to an injury, such as falling or being hit by a car. If you have an older cat, you might need to evaluate their living space to eliminate the possibility of them jumping to dangerous heights and injuring themselves, such as an inviting bookshelf leading to the precarious peak of a cabinet.


5. Congenital Disorders

Although somewhat rare, there are a range of genetic disorders that your cat may have been born with that can cause spinal issues. Signs of a congenital disorder generally appear when your cat is around 2 years old but will require a diagnosis by a veterinarian.

owner-petting-their-cat-on-the-back
Image Credit: Unsplash

divider 3 paws

When Should You Take Your Cat to the Vet for a Lump Near Their Spine

While you don’t know if the lump is life-threatening, you should always take your cat to the vet when you discover any issues or lumps near their spinal cord. The central nervous system is crucial to your cat’s health, and an early diagnosis lends to a more hopeful prognosis.

When you visit your vet, take all of your cat’s medical records and tell them about any other unusual symptoms your cat may have been experiencing, including other mobility issues. Your veterinarian will likely conduct extensive diagnostic testing, such as running blood tests and scans, to rule out cancer and other serious diseases.

divider cats oct 2024

Conclusion

If your cat has a lump on their back near the spine it may be caused by anything from an injury to a life-threatening illness. You should always take your cat to the vet to be evaluated as quickly as possible. The sooner they reach a diagnosis, the sooner you can put your cat on the road to recovery, or at least make them comfortable for as long as possible.

Unfortunately, cancer and FIP are common diagnoses, but there’s also a chance that your cat is having mobility issues due to an intervertebral disk disease or injury. Acting quickly can preserve their ability to walk and enjoy a greater quality of life.

See also:


Featured Image Credit: Maria Sbytova, 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

4 Responses

  1. hi i think my cat fell from windows ledge inside house he fell down back of tv he now has a lump at base of his tail he's not a lively still eating n drinking his water there was a small bit of blood we washed it and put salon on it he's not crying as if he's not in pain

    1. Hi Ann. It is very worrying when your cat has an accident and develops a new lump, especially if he is less lively than usual. Any fall, even if it seems minor, can result in injuries that are not immediately obvious.
      The lump at the base of his tail, the small amount of blood, and the change in his energy level are signs that he needs immediate veterinary attention. A veterinarian needs to examine the lump to determine if it is a bruise, an abscess, or an injury to the tail or spine.

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

Go! Solutions by Petcurean Cat Food Review in 2026: Recalls, Pros & Cons

Go! Solutions by Petcurean is a line of cat food that caters to your kitty’s inner beast. Each recipe is carefully crafted to...

Can You Use Baby Shampoo on a Cat? Feline Shampoo Guide

Many cats don’t particularly enjoy being bathed, but sometimes it is necessary. Most cats never need shampooing, but if your cat has a...

IBS In Cats: Our Vet Explains Causes, Signs & Treatments

Irritable bowel syndrome—the name alone is enough to make you feel uncomfortable. Even if you’ve been fortunate enough to never experience the pain,...

What’s the Cost of Chemotherapy for Cats? 2026 Price Overview

Cancer is a very serious disease in cats, and it’s one of the most common causes of death for elderly felines. Chemotherapy is...

Keep reading

Can Cats Eat Pine Needles? Vet-Approved Risks & Alternatives

If you want to celebrate Christmas with a beautiful pine tree in your house, but you also own a cat or two, you know how tricky this can be. Beyond the usual hazards of your cat vs. the Christmas tree,...

Can Cats Eat Pine Needles

15 Hazards That Could Hurt or Kill Your Cat & How to Avoid Them (Vet Reviewed)

When you are at home relaxing with your cat, you might be totally oblivious to all the hazards around the home. After all, we don’t foresee some events, making it difficult to navigate. While we could go on for hours...

vet wrapping cat's injured paw with bandage

Nutro Cat Food Review of 2026: Recalls, Pros & Cons

Nutro Cat Food Review Summary Founded in the 1920s, Nutro is an American pet food manufacturing company and a subsidiary of Mars Inc., which also manufactures other pet food brands, including Whiskas, Royal Canin, and Iams, and is now headquartered...

Nutro Cat Food Review

Why Does a Comb Make a Cat Gag? Vet-Reviewed Facts & FAQ

Maybe you have seen the videos online or experienced this yourself at home: you flick the teeth of a comb, and your cat gags. Why? Cats are far more sensitive to sounds than humans, and they can hear frequencies that...

a cat that feels sick and seems to vomit

How to Tell if Your Cat Is Happy: 16 Vet-Reviewed Signs

Some people prefer dogs to cats because dogs are considered easier to read and more demonstrative with their affection. Many cat enthusiasts will insist that if you know what you’re looking for, it’s quite easy to know if your cat...

bengal cat being stroked by man's hand and purring

Is Nephthytis (Arrowhead Plant) Poisonous to Cats? Vet-Reviewed Houseplants Examined

Nephthytis (arrowhead plant) is a common and popular houseplant due to its air-purifying properties. If you’re a plant and a cat lover, you may be wondering if nephthytis is poisonous to cats. The short answer is yes, nephthytis can be...

Catster_Is Nephthytis Poisonous to Cats

10 Best Ringworm Shampoos for Cats in 2026: Reviews & Top Picks

Ringworm is an annoying fungal infection that our cats may develop from time to time, and even worse, it can spread to us. Getting rid of ringworm is vital to stopping its spread, and that’s where ringworm shampoos come in....

cat bathing in the bathroom

Does Bleach Kill Fleas on Cats? Vet-Verified Facts & Safety Guide

Have you spotted fleas crawling all over your favorite furry friend? You might have heard that bleach can kill fleas, but hold off before grabbing the bleach bottle! While bleach will kill fleas on hard surfaces, it should never be...

Bleach Bottle Spray

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.