When women are pregnant, their breasts may feel swollen and painful, which is generally a normal physiological phenomenon, mainly related to the hormonal changes in the body during pregnancy, but serious symptoms also need to consult a doctor in time. During pregnancy, estrogen and progesterone in the body will change, which will stimulate the development of mammary glands and cause breast enlargement, some women will experience slight swelling and pain in the breasts, and there may be deepening of the areola color, nipple enlargement and other manifestations, which are mostly normal phenomena. As the hormone level of pregnant women gradually stabilizes, the breast swelling and pain will gradually decrease. Some women may not have significant breast tenderness, which is also normal and not a cause for concern. If the symptoms are severe or accompanied by other symptoms, attention should be paid to the pregnant woman, and it is recommended to consult a doctor in time to find out the cause.