Under normal circumstances, women’s menstrual period is around 3-7 days. Brown blood on the 6th day of menstruation is often a physiological manifestation. As the menstrual blood has not yet been discharged and the amount of lining peeled off is relatively small, you can temporarily not do any examination and treatment, and continue to observe, as long as the menstruation can be completely clean on the 7th day, it is a physiological symptom. If a woman’s period lasts more than 7 days and there is brown blood, it is considered to be a prolonged menstrual period. It may be caused by organic diseases or endocrine dysfunction, such as endometrial polyps, uterine scar diverticulum, adenomyosis and luteal atrophy, which may lead to prolonged menstruation.