A little left abdominal pain after stool may be caused by inflammatory bowel disease, gastrointestinal dysfunction, rectal malignant tumor and other reasons. 1. Inflammatory bowel disease: Inflammatory bowel disease mainly includes ulcerative colitis, Crohn’s disease, etc. Because intestinal inflammation is easy to stimulate the local spasm and other reactions, so there will be left abdominal pain after bowel movement. You can take Liuzosulfapyridine, mesalazine and other drugs under the guidance of the doctor. 2. Gastrointestinal dysfunction: it may be caused by irregular diet, unclean diet or mental factors, and the increase of intestinal peristalsis before defecation can lead to abdominal discomfort and the symptom of left abdominal pain after bowel movement. Usually, you can take drugs to promote gastric power, such as domperidone tablets. 3. Rectal malignant tumor: usually there will be a change in bowel habit, and some people will have blood in the stool and the performance of unshaped stool. If constipation occurs and forceful defecation, the symptoms of left abdominal pain may occur, if necessary, need to take the way of surgical treatment. A little left abdominal pain after defecation is also seen in other causes, should be timely to the hospital, after clarifying the cause of the disease, according to the doctor’s guidance for the rational use of drugs and standardized treatment, so as not to delay the condition.