Failure to pass bowel movements is associated with constipation, intestinal obstruction, irritable bowel syndrome and other factors. People who are constipated will have relatively fewer bowel movements, even less than three a week. During an attack of constipation, there will be an increase in the number of bowel movements because the stagnation of feces in the intestines will cause irritation to the intestinal mucosa, which will result in the production of a large amount of gas. However, because the feces are too dry, it is more difficult to expel the feces, and stools will not come out. In some people, intestinal obstruction is incomplete. Since the intestinal tract is not completely blocked, part of the gas can pass, but the feces cannot pass, and then the phenomenon of only exhausting the gas but not passing the feces will occur. The symptoms of irritable bowel syndrome are varied, and many patients are mainly constipated. During an episode of irritable bowel syndrome, not only is the absorption function of the intestines impaired, but also the peristalsis of the intestines is slowed. Since the intestines are unable to absorb the gas in the intestinal lumen, it is released through the anus when too much gas accumulates. The feces in the intestines are not excreted in a timely manner because of the slow peristaltic function.