Constipation is the most common digestive tract symptom; it is not a disease. It is reported that 2 to 3 million people in the United States are constipated each year to take medication to help the stool, the incidence of about 2%; a group of statistics show that about 900 people die each year from diseases related to constipation. It can be seen that constipation should not be taken lightly. Constipation causes complex, can be summarized into the following four categories: 1, colorectal diseases: ① congenital diseases, such as congenital megacolon; ② intestinal stenosis, such as inflammatory bowel disease, late trauma and stenosis after intestinal anastomosis, tumors and their metastases caused by intestinal stenosis; ③ export obstruction, such as pelvic floor dislaxation, rectal intussusception, perineal descent, rectal protrusion; ④ anal canal and perianal diseases, such as anal fissure, hemorrhoids, etc.; ⑤ other: such as irritable bowel syndrome. 2, extra-intestinal diseases: ① neurological and psychiatric diseases, such as cerebral infarction, cerebral atrophy, paraplegia, depression, anorexia, etc.; ② endocrine and metabolic diseases, hypothyroidism, diabetes, aluminum poisoning, vitamin B1 deficiency; ③ pelvic diseases, such as endometriosis, etc.; ④ pharmacogenic diseases, such as stimulant laxatives (phenolphthalein, rhubarb, senna) can cause secondary constipation when taken in large quantities for a long time, narcotics (morphine), anticholinergics, calcium, etc. ), anticholinergics, calcium channel blockers, antidepressants, etc. can cause a decrease in intestinal stress; ⑤ myopathy, such as dermatomyositis, scleroderma, etc. 3, bad habits: ① too little food, fine food, high calorie food, less vegetables and fruits, less water, insufficient intestinal stimulation; ② less exercise, sedentary, bed-ridden, so that the lack of intestinal power; ③ caused by poor defecation habits, such as elementary school students because of the short time between classes to hold back the stool, resulting in constipation. 4, social and psychological factors: ① work tension, sedentary, insufficient exercise; ② interpersonal tension, family discord, long-term mood in a state of depression, can make the plant nervous disorder, causing intestinal peristalsis inhibition or hyperactivity; ③ life pattern changes, such as travel, hospitalization, the impact of unexpected events, can lead to changes in the regularity of defecation.