Breast swelling and pain after pregnancy will last for about three months, because the breasts are prepared for nursing the baby after pregnancy, so swelling and pain will occur in the early stages of pregnancy, and the pain will usually disappear in about three months. You can choose to apply hot compresses to your breasts, using hot towels 1-3 times a day for about 10 minutes each time. You can also massage your breasts three times a day in a clockwise or counterclockwise direction to relieve the pain. In the sixth month of pregnancy you can wash your breasts with warm water every day, apply a hot compress for a while, and then gently stretch the nipples outward in order to facilitate the baby’s sucking later. Pregnancy breast swelling is actually a normal phenomenon that prepares you for postpartum breastfeeding. In addition to hot compresses and massage, you can also change to looser underwear.