Twice a month, aunt. Why?

Menstruation cycle has follicle development and ovulation, but luteal phase progesterone secretion is insufficient or luteal premature decline, resulting in poor endometrial secretion response and luteal phase shortening. Diagnosis is based on medical history, gynecological examination, whether there is abnormal uterine bleeding caused by genital organic lesions, basal temperature biphasic, but the high temperature phase is less than 11 days, endometrial biopsy shows that the secretion response is at least two days behind, can make a diagnosis.