How often do you inspect your cat’s anus? Sure, many cat owners don’t like to do this, and in fact, outright avoid it.

However, if your beloved cat has a swollen anus, this can be caused by cancer, says veterinarian Dr. Jules Benson, BVSc, chief veterinary officer with NationwideDVM, a pet insurer company.

Swollen Anus in a Cat: Common Cancers

“Yes – swellings or visible masses around the anus can be caused by cancerous growths,” says Dr. Benson.

The most common abnormal growths in the anal area of a cat are anal gland adenocarcinoma and fibrosarcoma.

“Your vet can help to determine what the cause might be by examining your pet and taking biopsies of any swellings,” says Dr. Benson.

“Unfortunately, adenocarcinoma and fibrosarcoma do not have good prognoses, but evaluation by a veterinarian or even consultation with a veterinary oncologist can result in positive outcomes.”

Treatments Are Expensive

“While these treatments are often expensive, having pet insurance that covers standard cancer treatments can make the difference between being able to pursue the most cutting-edge treatment options, versus palliative care to just keep your pet comfortable,” says Dr. Benson. 

Dr. Benson is regularly consulted by many media outlets including ABC, NBC, FOX, The Wall Street Journal and The New York Times to provide pet health advice to pet parents nationwide. pupp
Lorra Garrick has been covering medical, fitness and cybersecurity topics for many years, having written thousands of articles for print magazines and websites, including as a ghostwriter. She’s also a former ACE-certified personal trainer.