Breast endocrine medications have the potential to affect menstruation. Drugs for treating breast endocrine because they themselves regulate the endocrine system, they tend to affect the hormone levels in the body to a certain extent. Menstruation is often affected by the hormone levels, and it may happen that the menstrual flow increases, the menstrual flow decreases or the menstrual flow is delayed. After taking breast endocrine pills, if there are serious changes in menstruation, such as too little menstruation or too much menstruation, etc., you should go to the hospital in time, cooperate with the doctor to take examination and treatment, and stop using the medicine and change to other medicines for treatment if necessary. Breast endocrine drugs must be used under the guidance of a doctor, and patients should not use the drugs on their own.