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Why does my cat have recurring vomiting, diarrhea, and constipation?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 6 years and 1 month old | 15 lbs

My 6-yr old cat has been getting sick for about a week every 4-6 weeks. She starts throwing up a few times a day for a few days. Then she throws up a pink liquid only. Then she has diarrhea sometimes with a red mucous. And sometimes she's constipated. My vet says there's nothing wrong with her. A 2nd vet thought she might have a food allergy. Any ghoughts?

1 Answer

Most Helpful Answer

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Answered By Christie Long, DVM

Veterinarian, Certified Veterinary Acupuncturist

Published on May 17th, 2018

Certainly mild to moderate food allergies can be the cause of intermittent GI disease, however Shirley's signs seem a bit more serious that what I typically see what food allergies. I hope that you have considered blood work and imaging (x-rays, ultrasound) of the abdomen, because you need to also consider whether this could be due to an intermittent blockage in the stomach or intestines due to a foreign body. Before you consider a diet change to test for food allergies I would want to be sure you have ruled out more serious problems.

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