The reasons why cats tremble all over:

1. The environment is not adapted to it. The cat may have just changed to a new environment, is unfamiliar with the surroundings and is nervous, afraid to relax and trembling.

2. Fear. When encountering dangerous and powerful enemies, cats will tremble out of fear.

3. Sick. The cat may be sick. Many diseases can cause the cat's body temperature to drop or appear neurological symptoms, including trembling or convulsions, such as feline distemper.

4. The temperature is too low. When the temperature drops, if there are no measures to keep the cat warm, the cat will also shiver because of the cold.

5. Uneven nutrition. If a cat lacks calcium, it will tremble. Especially if the female cat has postpartum hypocalcemia, body trembling is a typical symptom.