What causes breast pain in pregnancy?
For many women, sore breasts are one of the earliest signs of pregnancy. Some feel this symptom (which may also be a sign of impending menstruation) as a heaviness or tenderness in the entire breast, while others feel a tingling in the area around the nipple. These sensations are caused by the changes in your breasts brought on by increases in the hormones progesterone and estrogen. Breast tenderness may come and go throughout pregnancy as your breasts prepare themselves for the major job of producing milk for your baby.