Cat vomiting may be caused by improper diet, gastroenteritis, indigestion, internal parasites, hairball disease, or viral infection. You need to observe whether there are other abnormalities in the cat's body. If the cat appears mentally ill, If the cat has poor appetite, vomiting and diarrhea, etc., it is best to send it to a pet hospital for examination and treatment; if the cat has no other abnormalities, it can be fed some probiotics and hair removal cream.