There are several reasons for left lower abdominal pain: First, there may be left-sided adnexitis, so you will feel left lower abdominal pain. Second, in the ovulation period, there is ovulation pain or follicles are not discharged, continue to grow and pull the ovary envelope, will feel the left lower abdominal pain. Third, to rule out ectopic pregnancy, if there is a history of menopause or abnormal vaginal bleeding, accompanied by lower left abdominal pain, go to the hospital to check whether it is ectopic pregnancy. Fourth, there is another situation, there may be left ovarian cysts, such as chocolate cysts may also cause lower left abdominal pain. Which is the reason to go to the hospital for ultrasound, but also check the gynecological examination to see which cause of lower left abdominal pain.