Lower part pain in an 11 year old girl needs to be considered as trauma, inflammation and dysmenorrhea. If there is an accident during cycling or sports, it may cause trauma to the perineal area, i.e., straddle injuries, and pain and swelling in the perineal area, which can be basically diagnosed by appearance. Inflammation of the vulva as well as the vagina may also be caused if the child does not pay attention to personal hygiene during the day, with increased vaginal discharge, itching and pain. Infection of the vestibular gland will also form local redness, swelling, pain, and may have a burning sensation, and worsening of the symptoms will result in the formation of an abscess, with an obvious fluctuating sensation. 11-year-old girl has already had the first menstruation, the appearance of the lower part of the pain, you also need to consider the radiating pain caused by dysmenorrhea, if there is a clear regularity, accompanied by the appearance of the menstrual cycle can be diagnosed. Girls lower pain try to take the child to the hospital for examination, timely treatment, usually pay attention to good personal hygiene of the vulva, wash with water every day.