Possible causes of diarrhea include: a. Chronic infectious diseases, such as chronic bacterial dysentery, amoebiasis, etc., which require timely routine stool and stool culture testing. Second, intestinal ulcerative diseases, such as intestinal tuberculosis, inflammatory bowel disease, Crohn’s disease, ulcerative colitis, etc. can cause diarrhea all the time. Colonoscopy is needed to clarify the cause and take different treatment plans. Third, functional intestinal diseases, such as functional dyspepsia, irritable bowel syndrome, etc. are functional diseases, but also need further examination to exclude organic diseases before diagnosing this disease, mental stress and sleep conditions have a certain relationship. Fourth, intestinal tumors, such as intestinal cancer, benign tumors colon polyps may also cause diarrhea all the time, need to be examined by colonoscopy to clarify the cause, and take treatment for different causes.