Patients with heavy menstrual flow with blood clots need to be analyzed from the following aspects: first, the prevalence of the population, puberty and perimenopause. Puberty is mainly due to the imperfect regulation mechanism of menstruation; perimenopause is mainly due to the decline of ovarian function, which causes endocrine disorders. Second, some organic lesions, such as uterine fibroids, adenomyosis and so on. Thirdly, withdrawal bleeding caused by long-term or short-term oral contraceptive pills, or withdrawal bleeding caused by oral hormones for the treatment of amenorrhea, will lead to heavy menstrual flow with blood clots. Fourthly, it should be emphasized that certain patients who do not know they are pregnant and thus have miscarriages may also have heavy menstrual periods, with heavy bleeding accompanied by blood clots. Therefore, if you have heavy menstrual flow with blood clots, you need to go to the hospital in time to find out the cause and then treat the symptoms.