The reason for breast pain during the onset of menstruation is mainly due to the fact that the estrogen and progesterone secreted by the body will be significantly elevated during this period, and these hormones will cause a certain amount of stimulation to the mammary glands, resulting in breast swelling and pain, which is caused by physiological factors. Most women do not need to be treated because the condition will be alleviated with the onset of menstruation and the hormone secretion in the body gradually decreases or even disappears. It is recommended that patients need to maintain a good state of mind during this period, avoiding excessive emotional tension and anxiety, which is conducive to the alleviation of the condition.