Not having a bowel movement for a day is not considered constipation. Constipation is characterized by a decrease in the frequency of bowel movements, and having a bowel movement every 2-3 days or longer is called constipation. Doctors and patients have different understanding of the concept of constipation, the patient’s description of constipation can be any of the following three defecation disorders, one is the reduction in the frequency of defecation, the second is difficult or incomplete defecation, and the third is the stool is dry and hard, and the degree of performance of these three symptoms is not the same in each patient. Even though healthy people defecate once a day accounted for 60%, several times a day accounted for 30%, and once every few days to relieve the bowels accounted for 10%. Whether there is constipation or not should be judged according to the daily bowel movements, and each person should be judged according to his or her usual bowel habits and whether it is difficult to pass stools.