The lower left side of the stomach is the place where the following organs or tissues are located: First, the intestines, the jejunum and the colon, especially the descending colon, are usually located in the lower left side of the abdomen. Secondly, the middle and lower part of the ureter is also in the lower left abdomen. Third, in women, the left side of the uterus, such as the left fallopian tube and ovary, is also located in this area. If there is discomfort or pain in the left lower abdomen, it is important to consider the lesions of the above three organs, such as acute gastroenteritis or ureteral infection, ureteral stones; or gynecological inflammation, such as acute and chronic pelvic inflammatory disease or gynecological uterine adnexal lesions, ovarian corpus luteum rupture, or ectopic pregnancy rupture and bleeding, ovarian cyst torsion and other diseases.