Unclean menstruation may be related to endocrine disorders. If the estrogen and progesterone are not balanced, the endometrium will be thicker and the menstruation will always be unclean. If the luteal function is not complete, the level of progesterone in the body is low, which is easy to cause a longer duration of menstruation. In addition, organic diseases of the uterus and ovary, such as multiple uterine fibroids, adenomyosis or endometrial polyps, submucous uterine fibroids, and uterine incision diverticula, are prone to lead to unclean menstruation.