Chronic constipation is common worldwide and is a difficult condition. Epidemiology shows that chronic constipation is very common in all age groups and is more common in women, with about 40 million patients in China. Symptoms: (1) straining to defecate (2) lumpy or hard stools (3) incomplete defecation (4) anorectal obstruction during defecation (5) need to use manipulation to help (6) defecation less than 3 times a week