There are many reasons for left abdominal pain, one, caused by trauma, generally clear etiology, timely abdominal ultrasound to clarify whether there is organ damage, such as no organ damage pay attention to rest or local hot compress after the symptoms can gradually improve. Second, the left kidney stones, ureteral stones patients abdominal pain is more intense, often accompanied by lumbago, symptomatic treatment effect is not satisfactory, perform ultrasound examination can be clearly diagnosed. Third, abdominal tumors lead to, in addition to abdominal pain, patients will also be accompanied by abdominal mass, weakness, wasting and other manifestations, CT, nuclear magnetic can assist in the diagnosis, after confirming the diagnosis need to perform pathological examination. Prostatitis in male patients, ectopic pregnancy, endometritis, pelvic inflammatory disease, left-sided adnexitis, left-sided fibroids and other diseases in female patients can also cause left-sided abdominal pain, performing abdominal ultrasound, MRI, CT and other examinations can assist in the diagnosis, specific treatment needs to be combined with the actual situation of the patient. Fifth, some intestinal diseases can also cause, such as ulcerative colitis, Crohn’s disease and other patients in addition to abdominal pain will also be accompanied by changes in the nature, frequency and color of stool.