Pregnant women who have chest pains in early pregnancy are related to breast development. After pregnancy, the prolactin in the body will increase significantly, leading to breast development, breast follicle development, and breast tissue will also increase significantly. Many pregnant women’s breasts increase significantly after pregnancy, and in the middle of the enlargement process will lead to chest pain and breast swelling, which is more obvious in the first two months of pregnancy, and the symptoms will gradually ease as the body adapts and the development of the mammary gland alveoli slows down in the later stages. The main attention to breast care, do not wear particularly tight underwear, you can try to wear looser, comfortable breastfeeding underwear, pay attention to breast hygiene, do not over-stimulate the nipple.