If the menstrual blood has blood clots in it, it means that the menstrual flow is relatively heavy, and the reasons for the increase in menstrual flow are as follows: Firstly, the endometrial abnormality hyperplasia, which is more common in women who are about to go through menopause, is related to the hormone level disorders in the body, and the excessive proliferation of the endometrium will lead to unclean menstruation with blood clots. Secondly, if a woman has endometrial polyps and fibroids, it will affect the contraction of the uterus and lead to increased menstrual flow. Most polyps and fibroids do not affect menstruation, and the ones that do are usually larger endometrial polyps and submucosal fibroids, which have a greater impact on the endometrium, so you need to get checked for increased menstrual bleeding.