Most of the breast swelling and pain in the second month of pregnancy is due to the increase of estrogen and progesterone in the body after pregnancy, progesterone will promote the growth of breast alveoli, while estrogen will promote the growth of breast ducts, so the breast swelling and pain will occur. If the pain is still obvious after massage, you should go to the hospital for an ultrasound examination of the breasts to rule out any breast enlargement or breast nodules. In the early stages of pregnancy, most women will have nausea, vomiting and other gastrointestinal discomfort early pregnancy reaction, but also frequent urination and even breast tenderness, which is a normal phenomenon, usually after the third trimester will gradually be relieved and disappear, but women should also keep a stable mood during pregnancy, do not eat spicy, stimulating food, otherwise it will lead to breast tenderness enhanced.