Menstruation drags on for more than ten days is called prolonged menstruation, which may be caused by uterine pathology, such as endometrial polyps, submucosal fibroids, etc.; it may also be caused by endocrine disorders. 1. Endometrial polyps. Excessive proliferation of the endometrium leads to endometrial polyps, which causes the endometrium not to be completely peeled off during menstruation, resulting in dribbling. 2. Submucosal fibroids. Fibroids grow under the endometrium, increasing the size of the uterine cavity, leading to prolonged periods, usually accompanied by heavy menstrual flow. 3. Endocrine disorders. Luteal atrophy, when menstruation, the corpus luteum can not be completely atrophied, resulting in menstruation there is still a small amount of progesterone, the endometrium is slow to fall off, the menstrual flow is not complete. There are other reasons for prolonged menstrual periods, and it is recommended to go to the hospital for timely treatment.