Clinical practice has observed that there are more patients with constipation in women than in men, and data from foreign surveys in Europe and the United States show that the probability of constipation in women is twice as high as in male patients. So why is this the case? This is mainly related to the body’s instinctive bladder-anal reflex. The nerves of the urethral and anal sphincters originate from the same sympathetic, parasympathetic, and somatic nerves, which means that the bladder and anus are innervated by common vegetative and somatic nerves. When urinating, the electrical activity of the external sphincter is completely inhibited, while the electrical activity of the internal sphincter increases, at this time, in order to prevent the overflow of stool, the internal sphincter is in a state of contraction, this activity is not subject to conscious control, and is entirely a normal physiological reflex. Women due to urination for squatting, because of the different positions, women urinate abdominal pressure is higher than men, in order to prevent the discharge of feces in the rectum, through the bladder – rectal reflex, the tension of the internal sphincter to be higher than that of men, coupled with the female urethra is short, suffering from urinary tract infections have more chances of urinary frequency, often occurring, it is more likely to stimulate the internal sphincter spasms, and over time, the internal sphincter appears to be lost in the phenomenon of flaccidity. At this time, by the rectal sphincter reflex, the spasm of the internal sphincter is rectal expansion, fecal storage increases, water is absorbed by the transition, thus the occurrence of constipation. Why is anal pain prone to constipation? Many patients who have suffered from anorectal diseases or undergone anal surgery may have a common experience, that is, no matter what the reason is, once the anal pain attacks, the stool will be dry and difficult to solve. The author analyzes the reasons for constipation mainly from two aspects: ① psychological factors: due to the patient’s fear of defecation aggravated anal pain and thus long to hold back stool, resulting in feces in the rectum to stay too long, too much fecal water is over-absorbed by the rectum, resulting in fecal hard knots. ② reflex factors: due to various inflammatory stimulation of the anus, trauma stimulation (such as postoperative) will cause strong contraction of the anal casual muscle (casual muscle by the human consciousness), casual muscle mainly includes the external anal sphincter muscle and its upper puborectalis muscle, the two muscles are stimulated at the same time oppression of the internal sphincter, and finally caused by the internal sphincter of muscle tension increased. The internal sphincter is located on the inside of the external sphincter, and the two muscles are like two movable cannulas that can move up and down within a certain range. The internal sphincter is the continuation of the digestive tract ring muscle layer, not subject to conscious control and has the inherent characteristics of the digestive tract ring muscle, that is, easy spasmodic. When pain is caused by various factors in the anus, the outer sphincter is stimulated to produce contraction first, and then the inner sphincter also produces contraction, if the anal pain-causing factors can quickly disappear, the contraction of the inner and outer sphincter will be slowly relaxed; if the anal pain-causing factors (e.g., inflammation is not relieved) still exists, due to the characteristics of the inner sphincter, spasm is produced ultimately, and even thickening occurs, at this time, due to the spasm of the inner sphincter, resulting in the rectum In this case, the spasm of the internal sphincter causes the rectum to dilate retro-reflexively, the accumulation of feces increases and water is over-absorbed, resulting in constipation, which is the cause of internal sphincter dystrophy constipation. Why do we need to develop a good habit of regular bowel movement? Life, often because of work is really busy or due to the conditions do not allow, even if the intention to produce, but also through the artificial tightening of the anus until the last so that the intention to disappear, in the professional this belongs to the “reverse peristalsis” reflex, once in a while, intentional inhibition of defecation will not cause too great an impact on the human body, if the cerebral cortex to inhibit defecation often If the cerebral cortex often inhibits defecation, on the one hand, the rectum’s sensitivity to feces decreases; on the other hand, feces in the rectum, sigmoid colon stays for too long, the water is over-absorbed and makes the feces dry, resulting in persistent constipation. The highest “command” of the human body to control defecation – the cerebral cortex of the sacral spinal cord defecation center has a regulatory role. When people want to inhibit defecation, the external anal sphincter will strongly contract, the contraction of the external sphincter oppression of the internal sphincter, so that the internal sphincter contracture, at this time, due to the inherent characteristics of the smooth muscle (the gastrointestinal system are smooth muscle), the internal sphincter contracture is the rectal reflex dilatation, the rectal space to increase the feces are retained in the rectum, due to the dilatation of the rectum, the rectal wall of the tension decreases, and can cause the feces! Due to the dilatation of the rectum, the tension of the rectal wall decreases, which in turn causes the stimulation of defecation to weaken or disappear. The longer the feces stays, the more water is absorbed by the intestinal wall, so it is easier to cause constipation, or even worse, the patient does not have the intention to defecate at all. Therefore, it is very favorable to avoid constipation. In addition, because the defecation activity is by the cerebral cortex involved in the complexity, coordination, time conditioned reflex, so, usually should develop a good habit of regular defecation, do not easily destroy their own rules, which is not only very important for defecation, to maintain their own “biological clock” is also critical to stability.