Pain on the left side of the pelvis, there are several situations: 1, consider whether there is pelvic inflammatory disease, whether it is acute pelvic inflammatory disease or chronic pelvic inflammatory disease, there is a possibility of pain on the left side of the pelvis, such as ovarian inflammation, tubal inflammation, tubal hydrops and pus; 2, consider the intestinal problems, there is no dry stool, diarrhea, or intestinal spasms due to emotional overstress; 3, consider the urinary tract stones, if the Ureteral stones, kidney stones may radiate to the left pelvis; 4, consider the peritoneal irritation sign after ovarian ovulation; 5, consider whether the history of pelvic surgery combined with the left side of the pelvic adhesions resulting in chronic pain; 6, consider the appendicitis displacement to the left side and resulting in pain.