It is a common symptom of pregnant women. It is considered to be due to the increase in estrogen and progesterone levels in the body after pregnancy, which leads to the expansion of breast ducts and lobular hyperplasia of the breast, resulting in swelling and pain. Try to avoid local stimulation, especially don’t stimulate the nipples, keep the nipples clean and hygienic, wash them with warm water every day. During pregnancy, ensure sufficient sleep, rest more, do not stress too much, do not overwork, reasonably match a good nutritious diet, and usually wear breathable and comfortable underwear, not too tight. As the pregnancy period increases, the pain symptoms will gradually improve until the end of the pregnancy period, a slight swelling and discomfort in the breast is considered normal, if necessary, you can go to a regular hospital and let the doctor check the specific situation.