Reasons for cats suddenly biting:
1. If the cat feels very uncomfortable if you touch the sensitive parts of the cat, it may attack and bite people.

2. When a cat feels uncomfortable, it will bite to signal its owner and ask for help.

3. If the owner neglects the cat for a long time, the cat will attract the owner's attention through biting behavior.

4. When a cat is hungry, it will also bite people, reminding the owner to feed it.

5. If a cat is in a bad mood, feels nervous or scared, he will bite people to relieve his emotions in this way.

6. Explore the owner’s information scent. Like nibbling on your hand to explore how you smell outside.

7. Cat’s teeth are itchy. During the cat's tooth replacement period, the cat's teeth will be itchy, which will make the cat feel uncomfortable, so the cat will bite your hand lightly and use your hand as a teeth grinding tool.

8. Confess love to the owner. The cat bites the owner not because it wants to attack you, but because it wants to express its love to you, which means it likes you. This is also one of the ways cats show love.