Why does my cat bite me when I stroke them?

It is usually overstimulation: stroking that felt good becomes irritating, and the cat says so the only way they can. Most cats warn you first with a twitching tail, tensing body, flattened or swivelling ears, dilated pupils or a sudden turn of the head.

Stop as soon as you see those signs, and keep sessions short. If biting is new, see a vet, since pain can make touch unwelcome.

The long version: Reading the slow blink

General guidance, not a substitute for your vet. If your cat seems unwell, call them.