After pregnancy, the stimulation of progesterone will cause breast swelling and pain, which usually disappears after the third trimester of pregnancy. In the early stages of pregnancy, about 1 month after pregnancy, due to the body’s rising progesterone, will produce stimulation of the breasts, so that the breasts are difficult to adapt to a period of time and breast swelling and pain, to be 3 months after pregnancy, pregnant women’s body hormone levels will be relatively stable, the breasts of the body of the state of the high hormone is more adapted to the breasts will gradually stop swelling and pain. After pregnancy, it is recommended to wear loose, soft underwear to reduce the squeeze on the breasts, which can to a certain extent prevent the aggravation of breast swelling and pain. If there is a more serious case of breast swelling and pain, it is recommended to seek medical help in time to promote the reduction of breast swelling and pain. Pregnant women during pregnancy should pay attention to do a good job of prenatal checkups, actively listen to the advice of professional doctors to do a good job of comprehensive care and health care, pay attention to rest, at the same time should be relaxed, to avoid nervousness, anxiety, there is any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.