This situation is very bad. You can measure the temperature of your pet and send it to the hospital for treatment if it has a fever. If you just find out, you can try to deprive the cat of food, feed it with glucose and warm water to replenish its physical strength, and observe it for a while before making any plans. If the cat's condition lasts for a long time, it must be caused by internal disease and must be sent to a pet hospital for treatment to avoid losing the pet.