Diarrhea and fever appearing at the same time is more common in clinical practice, which mainly includes the following cases: 1, infectious diarrhea: mostly caused by bacteria, viruses, can occur in amoebic dysentery, rotavirus, food poisoning and other diseases; 2, chronic diseases: chronic amoebic dysentery, tuberculosis, inflammatory bowel disease, ulcerative colitis, Crohn’s, lymphoma, etc. are more common, careful medical history must be taken to identify; 3, tumors: for people over 40 years old, diarrhea with mucus and pus, abdominal pain, low fever, etc., need to be alert to the possibility of tumors.