Cat lumps, bumps, cysts, and tumours | treatment and prevention

Worried about a lump you spotted on your cat? Look at our list of common lumps, and see if you should get advice from your vet.

Photo of a cat during a lump check, on an article covering the most common types of lumps and bumps in cats

Overview

Lumps and bumps are surprisingly common in cats — especially as they get older. Some are caused by infections or minor injuries, while others are growths under or on the skin. Most turn out to be harmless, but a few can be serious. And because cats are experts at hiding discomfort, it’s important to check them regularly and act early if you spot anything unusual.

What are the different types of cat lumps?

What are the most common harmless cat lumps?

What are the most common cancerous lumps in cats?

Are lumps in cats always tumours?

How can I tell if a cat lump is serious?

How are cat lumps diagnosed?

How do I check my cat for lumps?

Cat lumps and bumps FAQs

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Medically reviewed by Lizzie Youens, BSc(Hons) BVSc MRCVS

Published on 16/01/2026 • Reviewed on 16/01/2026