Change of bowel habit refers to the change of the original bowel pattern, which is manifested by the change of the number of times of defecation, the color of the stool, and the shape of the stool. Normal people have their own relatively fixed defecation time, frequency and other defecation habits, defecation habit change refers to the original defecation habits on the basis of the change, can be manifested as the number of times of defecation, feces color, feces shape and so on change. Changes in bowel habits may be related to improper diet, medications, intestinal inflammation, intestinal tumors and so on. For example, when eating greasy and spicy food, the number of bowel movements decreases; when intestinal inflammation occurs, diarrhea and abdominal pain occur, and the number of bowel movements increases; when eating too much yellow-green food, green or yellow-brown feces occur; when taking iron supplements and gastrointestinal tract, black-green feces occur; and when intestinal tumors occur, the feces become thinner, and feces have blood in them, and so on. When there is a change in bowel habit, we should pay attention to it, go to the hospital in time to improve the examination, and treat it under the guidance of professional doctors to avoid delaying the condition.