There are more reasons for early menstruation with heavy clots. The most common cause is abnormal or no ovulation, which means that the endometrium thickens under the continuous action of estrogen without the counteraction of progesterone, which may lead to excessive menstruation and early menstruation. There are also submucosal fibroids, endometrial polyps, as well as cervical cancer and endometrial cancer, all of which may cause early and heavy menstruation. It is best to go to the hospital for ultrasound examination, vaginal examination and sex hormone six test. If it is caused by endocrine disorder, progesterone can be applied to regulate menstruation and stop bleeding. If it is caused by tumor, surgery is needed to determine the next step of treatment according to the patient’s age and the severity of symptoms.