The reasons why cats turn on their belly and twist around are as follows:

1. Attracting attention: When a cat trusts its owner, it will often turn on its belly to the owner. In fact, it wants the owner to touch its belly.

2. Parasites: The cat is likely to be infected with external parasites. When it turns its belly on you, it is actually asking you for help. If parasites are produced, it must be dewormed.

3. Acting coquettishly: The cat will turn its belly to act coquettishly towards its owner. At this time, the owner needs to squat down to respond to the cat, or take out the cat teasing stick and play with it for a while.

4. In heat: If the cat at home repeatedly performs this action, it may be a sign of heat. The owner can help find a mate or neuter it.