When menstruation takes longer than the normal range of 7 days, it is already the presence of menstrual dripping, which can be caused by more reasons. When there is endocrine hormone change, due to the change of hormone level, it may cause polycystic ovaries, prolactinemia, or even low estrogen, which may cause a long menstrual flow. When there are bilateral ovarian cysts, uterine fibroids, endometrial polyps, or cervical canal polyps, menstruation may take longer. When there is human papillomavirus infection, which means there is a chance of precancerous lesions and cervical inflammation, it will also cause a longer menstrual period. When there is ovarian hypofunction, due to the inability of the ovaries to supply normal ovarian hormonal changes, the menstrual period will take longer. In such cases, hormone tests, including ultrasound, are needed, and medication is required to regulate the situation.