Constipation is not an isolated disease, but a group of symptoms caused by a variety of diseases, the hidden causes are very complex, constipation generally refers to the process of defecation is not smooth, including: 1. low volume of stool, too hard, elimination difficulties. 2. defecation difficulties combined with some special syndromes, such as prolonged forceful defecation, rectal distension, incomplete defecation feeling or perhaps hand help defecation. 3. the number of bowel movements in 7 days less than 2-3 times. Constipation 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 gradually increased in recent years.