The feeling of emptiness in the left lower abdomen after bowel movement is due to the absence of feces accumulation in the intestines. Consider that the patient may have constipation or no bowel movement for several days, there is a large amount of feces in the intestine, after the bowel movement there is a state of diastole in the intestine, so it may feel that the left lower abdomen has an empty feeling. Clinically, if the patient has pain before defecation, and the pain is relieved after defecation, it is considered that there may be intestinal inflammation, and it is necessary to pay attention to observing the nature of the stools, and determining whether the patient has reddish stools, blood in the stools, whether there is mucus-like blood in the stools, etc., and whether there is diarrhea or constipation alternately, and it is recommended that colonoscopy can be carried out for the appearance of the above symptoms. In particular, if the patient is older than 40 years old, has a family history of intestinal tumors, and has recently lost weight, etc., it is recommended to consult the gastroenterology department of a regular hospital for colonoscopy.