Early menstruation may be caused by living habits, taking emergency contraceptive pills, and reduced luteal function in childbearing age. 1. Lifestyle habits: If the patient has mental depression, emotional tension and anxiety, sudden changes in the environment, emotional changes and other stressful states, or irregular work and rest, long-term late night, high-intensity work, overwork and strenuous exercise may cause endocrine disorders in women, the emergence of abnormal menstruation, and menstruation advancement. In this case, the patient can take oral progesterone under the guidance of the doctor to regulate menstruation, and at the same time, pay attention to the regularity of daily life and routine. 2. Taking emergency contraceptive pills: If the patient takes emergency contraceptive pills in the middle of two periods, the pills often contain a large amount of estrogen and progesterone, which will stimulate the hypothalamus-pituitary-ovary axis, easily leading to endocrine disorders, and menstruation may be advanced. If the patient pays attention to the regularity of work and rest in daily life and has a reasonable diet, the menstrual cycle will usually return to normal from the second month onwards. 3. Decrease in luteal function during childbearing age: If the luteal function decreases, the luteum will not be able to support the uterine lining, and the endometrium will fall off earlier, which will lead to early menstruation. It is recommended to exercise more, live a regular life, have balanced nutrition and improve physical fitness, which will slowly improve the condition of early menstruation. Early menstruation may also be related to other factors, such as abnormal menstruation, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease, and then follow the doctor’s instructions to deal with the treatment.