Short menstrual cycle is manifested as menstrual cycle less than 21 days, if it is caused by organic disease, need to actively treat the primary disease, if it is caused by ovarian luteal insufficiency, you can take short-acting contraceptive pills, dydrogesterone and other drugs to regulate. 1. Organic diseases: common diseases that cause short menstrual cycle include uterine fibroids, abnormal ovarian function, ovarian cysts, endometrial polyps and so on, which is a kind of pathology, patients should go to the hospital in time to do further examination, according to the results of the symptomatic treatment. 2. Ovarian luteal insufficiency: the reason for menstruation is the decrease of estrogen and progesterone secretion in the body due to luteal atrophy, endometrial necrosis and shedding, when the luteal insufficiency, the menstrual cycle will be shortened as well. This can be treated with medications such as short-term birth control pills or dextroprogesterone. Such drugs may have side effects such as irregular menstruation and are contraindicated in patients with allergies. If the symptoms of short menstrual cycle are severe, or if the symptoms persist and do not improve, the patient should go to the hospital for treatment.