Why does my cat have diarrhea?
Often it passes quickly. Cornell notes that a sudden food change or a stressful event, like a long drive, can bring on a few days of loose stool. It can also be a sign of infection, inflammation, organ or thyroid disease, or cancer. See your vet soon if it lasts beyond a day or two and your cat seems unwell.
What the sources say
Diarrhea is loose, watery stool that comes more often than usual and may smell strong or look pale. [1]
Most cases are brief and settle on their own or after a diet adjustment. [1]
Switching food suddenly or a stressful trip can set it off. Kittens moving onto solid food are more prone to it. [1]
When it keeps coming back, your vet may look for a longer term problem such as thyroid, kidney or liver disease, an infection, or cancer. [1]
Skip human diarrhea remedies, since Cornell cautions that some are unsafe for cats. [1]
🚩 When to see a vet
- Diarrhea that lasts more than a day or two
- Poor appetite, lethargy or vomiting along with diarrhea
- Blood or mucus in the stool
In an emergency, call your vet or nearest emergency animal clinic.
🚨 Poison emergency: call now
- Trouble breathing
- Collapse
- Seizures
- Bloated belly or retching with nothing coming up
- Suspected poisoning (chocolate, xylitol, lilies for cats, grapes)
- Heavy bleeding
- Male cat straining to pee
- Pale gums
ASPCA Animal Poison Control: (888) 426-4435 (a fee may apply)
Pet Poison Helpline: (855) 764-7661 (a fee applies)
FAQ
Can stress cause diarrhea in cats?
Yes. Cornell lists stress, like a long trip, as a cause of short episodes.
Can I give my cat a human diarrhea medicine?
No. Cornell cautions that some of these products can hurt cats. Ask your vet.
Sources
- Cornell Feline Health Center: Diarrhea, checked Oct 13, 2026
We summarize these sources in our own words. Dosing or home treatment amounts are never given here. Ask your vet.
