The reasons why cats suddenly twitch and then become fine:

1. Calcium deficiency: It may be caused by calcium deficiency in the body. At this time, you can buy calcium preparations for cats to take.

2. Afraid of water: If the cat twitches after taking a bath, it may be caused by fear of water and cold. The owner should pay attention to comfort the cat and blow dry the cat's hair as soon as possible.

3. Being frightened: Cats will also twitch when they are frightened. Just wait until the cat calms down.

4. Heatstroke: Cats will convulse when suffering from heatstroke, and the cat needs to be cooled down in time, otherwise it will threaten the cat’s life.

5. Disease: Some diseases can cause cats to convulse, such as epilepsy, encephalitis, hydrocephalus, brain tumors, etc. The owner needs to take the cat to the hospital for examination and treatment in time.

6. Hypoglycemia: Hypoglycemia in cats will cause body temperature to drop, muscle twitching, and rigidity, which can be relieved by timely supplementation of glucose and nutrients.