Lower abdominal pain after a week of clean menstruation is considered to be ovulation pain, pelvic inflammatory disease, cervicitis and so on. 1. Ovulation pain: a week or so after menstruation is generally in the ovulation period, a small number of women are more sensitive, there will be ovulation pain, because the follicle will rupture and discharge in the non-stop growth, in the process of discharge, the follicular fluid will stimulate the pelvic cavity to cause the symptoms of lower abdominal pain, the general pain is relatively mild, and will not last too long. 2. Pelvic inflammatory disease: Pelvic inflammatory disease refers to the inflammation of the upper reproductive tract organs and surrounding tissues, including endometritis, salpingitis, pelvic peritonitis, etc., due to the inflammation stimulation will also cause lower abdominal pain, usually persistent pain, aggravated after sexual intercourse or activities. 3. Cervicitis: Cervicitis is an inflammation that occurs in the mucous membrane of the cervix, usually caused by pathogen infection, and these inflammatory stimuli can also cause pain in the lower abdomen, usually accompanied by an increase in vaginal discharge, abnormal vaginal bleeding and other symptoms. Lower abdominal pain a week after menstruation, it is recommended to go to the hospital for a detailed examination, for the cause of the symptomatic treatment.