Constipation is not considered an isolated disease, but a group of symptoms caused by a variety of diseases, and the hidden causes are very complex. Constipation generally refers to the process of defecation is not smooth, including: 1) small amount of stool, too hard, difficult to expel; 2) defecation difficulties combined with some special syndromes, such as prolonged straining to defecate, rectal distension, incomplete defecation feeling or need to use hands to help defecate; 3~7 days less than 2~3 times the number of bowel movements. As a common disease, the prevalence of constipation in the population is about 3.68%, and the prevalence in the elderly increases to 10.9-20.3%. With the improvement of living standards and the refinement of diet, the incidence of constipation has been increasing year by year in recent years.