If a cat vomits, it is best to fast for about eight hours and observe the cat's condition. If the situation is serious, it is best to go to the hospital to check the cause of vomiting and treat it in time to avoid delaying the condition. If the vomiting is caused by improper diet, you can feed the cat some probiotics or gastrointestinal products to help regulate the gastrointestinal tract and promote gastrointestinal motility. If it is caused by other diseases, it is best to go to the hospital for examination and treatment.