The patient’s bowel sensation but cannot defecate is mostly related to the following diseases: 1. functional dyspepsia, because when the patient has functional dyspepsia, it will affect the normal operation of digestive system tissues, causing the peristalsis to slow down, and the excrement in the body cannot quickly reach the lower gastrointestinal tract such as the large intestine and anus, causing such bad symptoms. 2. occupational lesions in the lower gastrointestinal tract, such as rectal polyps, colorectal cancer, intestinal mucosal nerve tumors, etc.