Reasons for irregular menstruation? 1, uterine diseases: such as uterine polyps, fibroids, fibroadenomas, etc. will form the situation of excessive menstrual bleeding, for some submucosal fibroids or endometrial polyps often also have a lot of bleeding. 2.Pregnancy:Pregnancy due to the problems arising from implantation or the support of endometrium, so there will be abnormal bleeding in the early pregnancy, and then you need to be careful whether there is preterm labor or miscarriage. 3, thyroid problems: thyroid function is too low or too high phenomenon, will cause ovarian dysfunction, also had the phenomenon of menstrual disorders. 4, liver function is not good: liver function is not good will make women’s hormones slow down, resulting in endometrial hyperplasia, causing abnormal bleeding. 5, coagulation difficulties: for example, lack of platelets or leukemia, will be due to coagulation dysfunction, resulting in menstrual bleeding can not stop bleeding, and the formation of menstrual flow is quite heavy. 6, malignant diseases: such as cervical disease, endometrial disease, ovarian disease and some diseases that can secrete female hormones, resulting in endometrial hyperplasia and the formation of chaotic menstruation, or the cervix of the uterus directly because of disease attack, resulting in bleeding. 7, hormonal imbalance: especially in young girls and menopausal women, because of the hormonal imbalance caused by anovulatory bleeding, so that the first menstruation or soon to stop menstruation, menstruation presents a chaotic situation. In addition, the endometrium will grow without limit, so that it grows to the thickness of the endometrium that the uterus itself can not load, resulting in breakthrough bleeding. Therefore, the amount of menstrual blood is often a small amount of dark brown at the beginning of menstruation, which will evolve into a large amount of bleeding with the increase of time.