The duration of normal menstruation is 2 ~ 7 days, and a few are 3 ~ 5 days. If the menstrual period lasts for more than 7 days, even if the menstrual period is prolonged, it is an abnormal phenomenon. Attention should be paid to the prolongation of menstrual period. Pregnancy should be ruled out first, and then the following diseases should be considered: (1) Hematological diseases such as thrombocytopenic epilepsy and aplastic anemia are often accompanied by menstrual cramps. If severe uterine bleeding occurs, menstrual period will be prolonged. Others, such as chronic anemia, chronic hepatitis, liver cirrhosis and nephritis. , will make the blood vessel wall fragile, increase permeability, leading to bleeding. (2) Pelvic inflammatory disease, intrauterine femoral polyp and endometritis all cause menorrhagia and prolonged menstrual period due to poor circulation of femoral blood in uterus, degeneration and necrosis or pelvic congestion. (3) Chronic uterine hypertrophy's (Uterine Myositis) is due to pelvic congestion, and ovarian estrogen continues to increase, which makes the myometrium hypertrophy, causing menorrhagia and prolonged menstrual period. (5) Uterine fibroids, especially submucosal fibroids, can lead to menorrhagia and prolonged menstrual period due to the increase of uterine cavity area and abnormal contraction. (5) Uterine dysfunctional bleeding, such as anovulatory dysfunctional uterine bleeding, irregular endometrial shedding, etc., are all caused by endocrine dysfunction. 6) Endometriosis often leads to menorrhagia or prolonged menstruation due to the contraction of myometrium or the enhancement of endometrium. (7) Placement of IUD is also easy to cause long menstrual period. Therefore, prolonged menstrual period is caused by systemic diseases and many gynecological diseases, which should be differentiated and treated separately. It is recommended to come to the hospital in time to avoid delaying the illness. Usually pay attention to: 1. Avoid mental stress and excessive mental stimulation and keep a good mood. 2. Avoid heavy physical labor and strenuous exercise during menstruation. 3. Keep the vulva clean during menstruation, and it is forbidden to share the same room.