The left side of the abdomen pain usually have the following factors: 1, the most common factor is digestive system diseases, the left side of the abdomen pain the most common gastroenterological diseases is acute enteritis, in enteritis will appear in the above symptoms, such as ulcerative colitis or Crohn’s disease can appear in the left lower abdominal pain. 2, from the urology point of view is the most common factor is the urinary system of the stones, often to the kidneys, the third stenosis of the ureter stones are particularly significant. 3, general surgery, common femoral hernia, inguinal hernia, rectal hernia and other factors can lead to left lower abdomen pain. The most common factors from the urological point of view are urinary stones, often kidney, ureteral third stenosis of stones, men, such as acute prostatitis can also lead to left lower abdominal pain.3, such as general surgery diseases, common femoral hernia, inguinal hernia, straight hernia, and other factors can lead to the left lower abdominal pain.4, intestinal obstruction or intestinal perforation can lead to the left lower abdominal pain, such as women’s left tubal stone or left tubal ectopic pregnancy and other conditions, will lead to the above clinical symptoms and manifestations.