Is it normal for menstruation to come once every 20 days?

20 days to a menstrual period is abnormal, normal menstrual cycle for 21-35 days, 20 days to a menstrual period, belongs to menstrual frequency. There are many reasons for this situation, may be uterine or ovarian lesions, such as uterine fibroids, adenomyosis, ovarian cysts, etc. In addition, luteal insufficiency, thyroid disease, or emotional, work and study, life pressure and other factors will cause menstrual frequency. If this is the first time this problem occurs, you can continue to observe it for a period of time. If this condition has been continuously manifested, you should see a doctor in time, perform the corresponding examination, and carry out specific symptomatic treatment according to the examination results.