Constipation is not the name of a disease, but only refers to a category of syndromes in which multiple factors in the digestive tract create primary or secondary defecation disorders, and refers neither to transient constipation nor to the diagnosis of a single disease. It can be caused by a variety of reasons such as reduced intestinal transport function or obstruction of fecal output channels, and also includes constipation caused by painful disorders at the exit. The normal frequency of bowel movements is between 3 times/day and 3 times/week. No matter how often you have a bowel movement, as long as you have difficulty passing stool, you are constipated. This is due to constipation is meant to be dry and clotted stools, discharged with difficulty, or accompanied by incomplete bowel movements, abdominal distension and anal drop, and even dizziness and fatigue. Clinical manifestations include: 1, constipation, prolonged defecation time, less than 3 times / week, dry and hard feces, small amount, not smooth. 2.Difficulty in defecation, prolonged transportation time of feces in the colon, difficulty in passing, laborious discharging, or anal pain, crushing, incomplete bowel movements, or often relying on hand-assisted defecation. Any disease that affects the smooth muscle structure of the colon and the function of the nerve plexus of the intestinal wall is bound to be the main cause of colon constipation, which often leads to a decrease in the number of smooth muscle cells of the colon, and gradually replaced by fibrosis, so that the thinning of the wall of the colon, the power of the power to decline, some can develop into a megacolon, the megarectum. Studies have shown that solid feces are usually stored in the sigmoid colon or descending colon, and the rectum is generally empty, when the sigmoid colon contraction, the feces can be pushed into the rectum, rectal flap plus puborectalis muscle contraction of the anorectal angle to prevent feces from entering the rectum directly into the rectoanal tube. In addition to the slow movement of the colon, there is also a strong propulsion of feces into the rectum of the “group movement”, usually after waking up (colonic reflex), or after a meal, especially in the morning (gastro-colonic reflex or duodenal-colonic reflex), caused by the feces can be quickly from the transverse colon into the sigmoid colon, and then into the rectum. When the feces to a certain amount and a certain speed to the rectum, the rectal wall of the pressure receptors feel the stimulation, produce effective nerve impulses, impulses from the pelvic nerve or the infra-abdominal nerves to the spinal cord lumbosacral section of the primary defecation center, at the same time uploaded to the cerebral cortex of the higher center of defecation, and by the center sends out signals of defecation, causing the urge to defecate.