Abdominal pain on the seventh day of menstruation as well as yellow and white mixed liquid outflow are abnormal, which may be related to cervical lesions, vaginitis, pelvic inflammatory disease and so on. 1. Cervical lesions: when there is precancerous or cancerous lesions in the cervix, the secondary infection will also be manifested as lower abdominal pain, increased leukorrhea, mucopurulent, light yellow, which may be accompanied by peculiar smell. 2. Vaginitis: for example, trichomonas vaginitis, caused by trichomonas infection, this type of vaginal discharge is characterized by thin purulent, foamy and smelly. The color is grayish yellow and yellowish white. 3. Pelvic inflammatory disease: caused by a variety of pathogen infections, such as Neisseria gonorrhea, Chlamydia trachomatis and so on. Abdominal pain may be persistent, aggravated by activity, and prolonged menstrual periods may also occur. Vaginal discharge is increased and may be accompanied by an unpleasant odor. Abdominal pain on the seventh day of menstruation and a mixture of yellow and white fluid can also be seen for other reasons, it is recommended to seek medical attention, follow the doctor’s instructions to carry out relevant examinations, with the help of the doctor to clarify the nature, and targeted treatment or therapy.