The normal menstrual cycle of women is 21-35 days, but menstruation once every other month may be caused by menstrual disorders, polycystic ovary syndrome, thyroid function abnormalities, hyperprolactinemia and other factors, which should be dealt with symptomatically after clarifying the causes. 1, menstrual disorders: due to excessive dieting, staying up late, stress, etc. can cause prolonged menstruation, reduced menstrual flow and other symptoms, accompanied by abdominal pain, dizziness and other manifestations. If there is endometrial thickening in ultrasound examination, progesterone treatment is available; 2. polycystic ovary syndrome: there are often symptoms of scanty menstruation accompanied by hirsutism and acne, serum hormone level measurement and ultrasound examination should be done to confirm the diagnosis, and short-acting compound oral contraceptives and progesterone to regulate the menstrual cycle can be applied as prescribed by the doctor to promote normal ovulation; 3. other endocrine diseases: such as abnormal thyroid function, hyper Other endocrine diseases such as abnormal thyroid function, hyperprolactinemia, etc., can be diagnosed by corresponding hormone examination and treated under the guidance of doctors.