A cat's voice that suddenly becomes hoarse may be due to a cold. It is recommended that the owner observe the cat's mental condition, keep the cat warm, and provide corresponding treatment. Sometimes cats may suffer from internal heat and become hoarse. The owner needs to change the cat's diet to mainly light and easily digestible food. If your cat has a hoarse voice and is accompanied by pain and no sound, it should be caused by respiratory disease, and you need to take the cat to a pet hospital for treatment in time.