Petco Text Logo
Petco Pet Logo

  • Two Easy Ways to Start Earning Rewards!

Why is my cat's third eyelid red and he has yellow watery diarrhea?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male

Hi, for the past 2-3 days I noticed my cat nictitating membrane appear suddenly and it quite red and today the cat got diarrhea. Yellow colour watery stool. What's happening actually. I'm worried right now.

2 Answers

Most Helpful Answer

Image profile

Answered By Jenny, DVM

Veterinarian

Published on November 23rd, 2017

Any time you can see a cat's third eyelid, it is generally a sign they do feel well for whatever reason. In your case, it must have been a GI upset to cause the diarrhea. This can be from an infection, parasites or food. I would recommend seeing an emergency clinic since it has started a few days to get some testing done and antibiotics or probiotics to add to the food. They may want to try a sensitive stomach formula food to help until things get back to normal

Vote icon

1Pet Parents found this answer helpful

Other Answers

  • Image profile

    Answered By Dr. Leigh, DVM

    Veterinarian

    Published on July 16th, 2017

    It looks like she could have Haw's syndrome which can be caused by inflammation in the cat's intestines. A common reason is parasites (usually tapeworms), so it would be a great idea to deworm your cat with a tapeworm dewormer for cats. Your vet should be able to give you a prescription, if needed. If the problem persists or gets worse then she needs to be examined by a vet. You could also have your vet test a stool sample to make sure she doesn't have additional parasites.

    Vote icon

    1Pet Parents found this answer helpful

See More Answers

Related Questions

Petco Pet Education Center
Health & Wellbeing
Why is my mouse's eye swollen, cloudy, and has pus?
Is your mouse's eye swollen, cloudy, and pussy? Dr. Melanie, a certified vet, discusses severe eye issues like infection or abscess, urging an immediate visit.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet is breathing hard, not eating, and lethargic. What's wrong?
Is your rat breathing heavily, won't eat, and has no energy? A Licensed Vet Tech explains potential causes like infection and age, urging a vet visit for diagnosis.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My pet has red spots all over. What's causing them and what to do?
See red spots on your pet? A certified Petco vet discusses common causes like allergies, infections, or mites, guiding you on diagnosis and treatment options.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My small pet is limping and can't bear weight. Should I see a vet?
Is your pet limping and can't bear weight? A certified vet explains why a suspected fracture needs immediate diagnosis and safe pain relief. Get expert guidance.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My dwarf hamster has a shut eye and is limping. What should I do?
Is your dwarf hamster struggling with eye issues or limping? A trusted vet offers expert guidance on symptoms and crucial next steps for comfort and care.
Updated on December 04, 2025
Petco Pet Education Center
Health & Wellbeing
My degu lost teeth after an accident. How can I feed him soft foods?
Your degu had an accident, lost teeth, and can't eat hard food. A Petco Vet Tech offers crucial advice on immediate vet care and how to feed your injured degu.
Updated on December 04, 2025
image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Book Now

Sponsored