Left lower abdominal pain in women is commonly caused by the following reasons: left adnexal disease, left ureteral stone, left colon disease. 1. Left adnexal disease: the left adnexa (ovary and fallopian tube) is located in the left lower abdomen, if the adnexa occurred inflammation, swelling and other diseases, the left lower abdomen may appear pain, usually hidden pain. 2. Left ureteral stone: after the occurrence of stone in the lower part of the left ureter, it will lead to colic pain in the left lower abdomen, which often radiates to the perineum and is often accompanied by hematuria, and even accompanied by pain in the left lumbar region. 3. Left colon disease: part of the descending colon is located in the left lower abdomen, if the colon occurs diverticulitis, tumors and other diseases, the left lower abdomen pain may occur. It is recommended that patients go to the hospital, can improve the ultrasound, colonoscopy and other tests, usually can be clearly diagnosed.