I Found a Lump on My Cat's Abdomen

CatChannel veterinary expert Arnold Plotnick, DVM, explains what to do when your cat has a mysterious lump.

Posted: September 3, 2010, 3 a.m. EDT

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Q: I noticed that my cat seems to have a lump/growth on the lower left side of her stomach. She doesn't seem to be bothered by it. She seems to eat, run, jump, play, urinate and defecate like a healthy cat.

A: I suspect you mean there's a lump on the abdomen (her “belly”) rather than her stomach (the organ located inside her abdomen). I’m glad that she doesn’t seem to be bothered by it, but it still needs to be evaluated by your veterinarian. I cannot tell from your description if this lump is contained within the skin, or if it involves the tissues just beneath the skin. Either way, a vet should examine it. Your vet may want to aspirate the mass — insert a needle into it, suck back some of the cells from the mass into the hub of the needle, and then spray them onto a microscope slide. The vet mails the slide to a laboratory and a cytologist evaluates it to determine if it is benign, or if the lump is dangerous and needs to be removed. Most skin masses are benign, but better to play it on the safe side and have it looked at.

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I Found a Lump on My Cat's Abdomen

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Reader Comments

Ruth    Fredericktown, MO

11/11/2013 10:48:23 AM

I was doing a search on this specific topic when I came across this site.
My cat Cuddles, is a 7 year old Main Coon. I had noticed a small lump in her lower abdomen a few years ago, which we figured was scar tissue from getting her spayed at 6 months of age.
I notice a couple of weeks ago, while 'really' examining her, while she was eating, and discovered a large mass in her lower abdomen! I was mortified! So on Monday I called our vet to see about bringing Cuddles in to be examined & got an appointment for tomorrow afternoon. Should I be afraid of what I might be told about the mass? I'm really scared for her.

Zac    Alpine, TX

2/20/2013 3:12:06 PM

Thank you for your reply. The doc said that the little mass was most likely old scar tissue from an old injury. In any case he dismissed that it was a problem. Oh thank God! Blue Bell has more lives to live.

CatChannel Editor    Irvine, CA

2/4/2013 9:01:31 AM

Zacharias -- Yes, this would be a good time to discuss the lump you found on your cat. Thank you for taking him in to be examined. This is exactly the right course of action for your cat's health. Thank you!

Zacharias    Alpine, TX

2/1/2013 10:48:19 PM

Tomorrow is Saturday but I'm ready to bring my black short hair domestic Blue Bell to the vet. First noticed when I found him in August of 2009, he was around three months old-a lumpy mass on his left side below the ribcage and above the pelvis. It underneath the coat and skin. Nothings on his right side. Since his first birthday he's had his regulars, a couple of worm shots, and light examination by vet staffs. His behavior and appetite and energy is upbeat and never really unhappy. But, is it time we bring this up specifically and soon as possible to a professional? Thanks!

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