If you have a period that comes only once every few months, it is mainly due to abnormal ovulation of the ovaries, mostly seen in women with polycystic ovary syndrome or obese women. If you have fertility requirements, you should have a sex test during your menstrual period to see if there is an increase in androgens, and also to check for hyperandrogenism, an ultrasound to see if there are polycystic changes in the ovaries, and also to check for insulin resistance. In case of fertility requirements, ovulation promotion is needed to promote pregnancy. If there is no fertility requirement, obese women should control their weight and can use short-acting contraceptives or progesterone to adjust their menstruation. It is also important to check for the presence of polycystic ovary syndrome and to do a long-term management in the future, because polycystic ovary syndrome may have some endometrial lesions, or problems with cardiovascular disease and other long-term complications.