A cat gently biting your hand may mean the following:

Play with the owner. Cats are very curious and like to scratch and bite things. They may just use their hands as toys.

Teeth replacement period or oral disease. Cats will start to lose their teeth when they are 3-4 months old. At this time, their teeth will be very itchy and they need to bite something to relieve it.

Express physiological needs such as eating and drinking. Usually the owner places food for the cat with his hands. Over time, the cat may think that the hands represent food.

Defensive behavior when threatened. Cats will behave aggressively when they feel threatened.

Want to attract the owner’s attention. Cats may also bite you gently when they want to play with you or pay attention to them.