Auntie refers to menstruation, menstruation lasts for thirteen days and has not yet ended, if it is a woman of childbearing age, first of all, you need to clarify whether it is related to pregnancy, in addition to endocrine disorders may also be the cause of endocrine disorders, but also may be the result of vaginal inflammation, endometrial disease or cervical disease and other reasons. 1. Pregnancy-related: If the pregnancy is followed by preterm miscarriage, incomplete miscarriage or poor uterine recovery after complete miscarriage, the menstrual period may last for thirteen days and still not end. 2. Endocrine disorders: If a woman’s menstruation lasts too long, or the amount of menstruation increases, it is possible that hormonal disorders in the body lead to irregular menstruation. Common causes include abnormal thyroid function and polycystic ovary syndrome. 3. Endometriosis: Women who experience menstruation that lasts z thirteen days and is not yet over may also have abnormal bleeding caused by endometriosis. Diseases such as endometritis or endometrial cancer can cause abnormal uterine bleeding. 4. Cervical diseases: If a woman suffers from cervicitis and cervical cancer, the bleeding in the vagina may not be normal menstruation, but contact bleeding, giving the patient the false impression that her menstruation has lasted for thirteen days. There may be other reasons why menstruation lasts for thirteen days, so it is necessary to consult a doctor in time, and a professional physician can make an accurate diagnosis and standardize the treatment by combining the characteristics of the medical history and perfect examination, so as not to cause infections or anemia and other hazards to the patient’s safety.