If you have two periods in a month, if it is an occasional case, it may be related to the change of women’s habits, cold before and after menstruation or emotional abnormalities, etc. If it is an occasional case, you can temporarily observe and not deal with it. However, if you often have two periods a month, it is abnormal uterine bleeding, and you should have an ultrasound examination to understand the condition of the uterine attachments and the endometrium, and even a hormone level test to understand the condition of the ovaries. If ovarian dysfunction is the cause, medication should be given to adjust the menstrual cycle according to the hormone test. If the ultrasound indicates endometrial thickening or abnormal echogenicity, further hysteroscopy and endometrial scraping can be performed to clarify the diagnosis.