Menstruation delayed for 20 days may be caused by pregnancy, endocrine disorders, pituitary tumors, ovulation abnormalities, etc., and need to be treated according to their specific causes. 1. Pregnancy: If you are sexually active and your period is delayed for 20 days, you can go for HCG and ultrasound examination, and generally no treatment is needed. 2. Endocrine disorders: mainly can be treated by adjusting lifestyle, adjusting work and rest. 3. Pituitary tumor: it can be treated by drugs such as bromocriptine or surgery. 4. Ovulation abnormalities: such as polycystic ovary syndrome, can be adjusted by adjusting work and rest, oral contraceptives, such as levonorgestrel, etc.; early onset ovarian insufficiency, can be supplemented with estrogen and progesterone, such as Nystatin, progesterone, etc., but also through psychological and lifestyle interventions and other ways of treatment. Clinically, if the symptoms of menstruation delayed for 20 days, you should promptly consult a doctor for diagnosis and treatment according to the diagnostic results, and specific drugs should be used under the guidance of a doctor.