Protruding sides of the cat’s belly may be caused by indigestion, internal parasite infection, hair ball disease or other diseases. It is necessary to observe whether the cat has other symptoms. If the cat is in poor spirits, does not eat or drink, etc. , it is best to send the cat to the pet hospital for examination and treatment in time to avoid delaying the condition. If the cat is in good mental state, you can give the cat some probiotics to promote digestion, and deworm the cat on time.