Harmful, toxins in the body can not be discharged.

Excessive defecation will lead to changes in coronary artery and cerebral blood flow. Due to the decrease of cerebral blood flow, fainting may occur during defecation. Angina pectoris and myocardial infarction can occur in patients with insufficient coronary blood supply. Hypertensive people can cause cerebrovascular accidents, ruptured aneurysm or ventricular aneurysm, thrombus attached to the heart falling off, arrhythmia and even sudden death. Low muscular tension of colon can lead to Hirschsprung's disease. The increase of intra-abdominal pressure during forced defecation can cause or aggravate hemorrhoids, and the anal canal is damaged during forced defecation, which can cause perianal diseases such as anal fissure. Intestinal obstruction, fecal ulcer, urinary retention and fecal incontinence will occur after fecal impaction.