The left side of the belly is swollen, leukorrhea, walking pain may be endometritis, left salpingitis, left tubo-ovarian pus and other causes. 1. endometritis: pathogenic bacteria invasion to the endometrium, will lead to endometrial congestion and edema, a large number of inflammatory exudate secretion, may lead to the appearance of the left side of the belly, swelling, leucorrhea, walking pain symptoms. 2. Tubulitis: inflammation spreads upward through the endometrium, which may cause left tubulitis, tubal mucosal swelling, exudate secretion, which may lead to the left side of the stomach swelling and leucorrhoea, walking pain. 3. Tubo-ovarian pus: as the disease continues to worsen, the inflammation spreads to the ovaries, if the pus accumulates in the lumen of the tubes, then the formation of tubo-ovarian pus, the patient in addition to the left side of the belly swelling leucorrhoea and walking pain, there will also be the left side of the abdominal mass of the situation. If the patient appeared to the left side of the small belly swelling leucorrhoea walking pain, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, to give targeted treatment or standardized treatment.