Left lower abdominal pain is mainly seen in the following cases: 1, colonic inflammation, mainly due to bacteria, viruses, parasites, genetics and autoimmune causes, the main damage is the colonic mucosa, when the colonic mucosa is damaged with inflammatory cells infiltration, congestion, edema, can lead to pain in the left lower abdomen, accompanied by an increase in the number of stools, most patients can relieve abdominal pain symptoms after the stool; 2, abdominal Strain, when the abdomen for a long time in a posture or excessive force, such as driving for a long time, doing sit-ups, etc., can lead to abdominal muscle strain, the degree of pain and the time and degree of abdominal muscle force, but the situation will not appear to increase the number of stools. 3, acute and chronic pancreatitis, when the pancreas is inflamed, because the site of pain is the left upper abdomen, but individual pain can radiate to the left lower abdomen; 4, the female population may also be caused by inflammation of reproductive organs, such as pelvic inflammatory disease, adnexitis and tubal inflammation, etc.