Most normal people, regardless of gender and age, have a bowel movement once a day. However, there are a few people who have a bowel movement once every 2-3 days. As long as the stool is normal in nature, not dry and hard, and the bowel movement is smooth and painless, it is a normal physiological difference. If there is dry stool, difficulty in defecation, disruption of the normal bowel pattern, or incomplete defecation, it is called constipation. Constipation has two common causes: (1) organic causes, constipation caused by certain primary organic lesions or diseases, it is only a concomitant symptom. For example: anal colorectal tumor, chronic inflammation causing intestinal lumen narrowing; megacolon, abdominal surgery complicated by intestinal adhesions or incomplete intestinal obstruction; or huge intra-abdominal tumor, late pregnancy, etc., which mostly requires surgery to cure. (2) Functional constipation, that is, constipation caused by the weakened physiological peristaltic function of the intestine; or defecation power is insufficient, defecation is weak; or due to the influence of life, work, mental and other factors and neglect of bowel movement, or too little diet or too fine food and insufficient water, the intestine can not form a certain amount of stimulation, thus causing constipation. There are also some drugs that can inhibit or weaken intestinal motility, such as morphine, codeine, aluminum hydroxide, metformin, etc. can also cause constipation. In addition, there are some anorectal diseases that cause constipation, such as anterior rectal protrusion, intra-rectal overlap, perineal descent syndrome, pelvic floor muscle spasm syndrome, puborectal muscle syndrome, etc., called functional outlet constipation, which is difficult to treat and sometimes requires surgery to cure. In conclusion, constipation is a common clinical condition. It is estimated that half of the population has suffered from constipation. It often brings greater pain to patients, seriously affecting the quality of life, because of its causes are more, but also very complex, should be promptly to the hospital examination, clear cause, the cause of treatment can be completely cured, do not take it lightly or their own abuse of laxatives, the treatment does not cure the symptoms, and even lead to “laxative colon” and “laxative dependence. Laxative dependence”.