Emergency contraceptive pills may affect menstruation. Emergency contraceptive pills are usually compound preparations made of estrogen and progesterone, which will affect the endocrine system, causing disruption of estrogen and progesterone in the body, and the imbalance of hormone levels may cause abnormalities in menstruation. The effect of emergency contraceptive pills on menstruation is related to the number of times it is taken, the amount of pills taken, the individual’s physical condition and other factors. Women should not take emergency contraceptive pills casually, a short period of time, if taken continuously, may have a great impact on the body’s endocrine system, which in turn affects the health of the body, for women of childbearing age do not have childbearing requirements, you need to do a good job of contraceptive measures beforehand. Taking emergency contraceptive pills need to be standardized under the guidance of a professional doctor to avoid adverse consequences.