Pain on the left side of the navel, relieved after a bowel movement may be due to irritable bowel syndrome, various chronic intestinal inflammation, incomplete intestinal obstruction and so on. 1. Irritable bowel syndrome: a functional gastrointestinal disease, mostly pain or discomfort on the left side of the navel as a clinical manifestation, relieved after defecation. 2. Various chronic intestinal inflammation: inflammation or ulceration of the intestinal mucosa, long-term stimulation of the mucosa after the retention of persistent feces, resulting in pain on the left side of the navel, after defecation, the intestinal tract empty, the irritation of the symptoms can be relieved after the reduction of the symptoms. 3. Incomplete intestinal obstruction: the intestinal tract is not completely obstructed, there are feces and gas in the intestinal tract, which can not be completely discharged, and thus pain in the left side of the navel occurs, which is relieved after defecation. There are many other reasons for the pain on the left side of the navel, relieved after defecation, patients should consult a doctor in a timely manner, improve the relevant examination to clarify the cause of the disease, in the doctor’s formal guidance under the use of medication.