Vomiting is not a frequent thing in cats. Some people believe it is OK for a cat to vomit every few days, but this is not the case. Rare vomiting or the occasional hairball are not causes for concern. Anything more than this, however, necessitates a visit to the veterinarian.
Diarrhea can signify a range of problems, including food in discretion, intestinal parasites, and a variety of other issues. Diarrhea, if left untreated, can cause dehydration and additional intestinal inflammation. It’s also incredibly distressing for your cat. Make an appointment with your veterinarian and, if feasible, bring a stool sample with you.