Breast tenderness in early pregnancy is a normal early pregnancy reaction, mostly caused by the change of estrogen level in the body, which lasts for about 2-3 months, and can gradually decrease and disappear in the middle of pregnancy when the hormone level in the body gradually stabilizes. In early pregnancy, the high content of estrogen and progesterone stimulates the development of mammary gland ducts and alveoli, which gradually increases the size of pregnant women’s breasts and enhances the function of mammary glands, thus causing breast pain and swelling. During this period, patients should pay attention to wearing loose cotton underwear, avoid squeezing the breasts, and maintain emotional stability to avoid aggravating breast swelling and pain. During this period, pregnant women should pay attention to eating a light diet and avoid eating too greasy food. During this period, pregnant women should pay attention to a light diet and avoid eating too much oily food.