Breasts do not hurt when touched normally, but if it hurts when touched, it may be before menstruation or before ovulation, which may cause swelling and pain due to the increase of estrogen secreted by the ovaries, i.e., there will be swelling and pain when touched, and it will also be painful when touched during the developmental period of a young girl when her breasts are still developing. When you are pregnant or have a baby and want to breastfeed, the mammary glands develop twice under the action of progesterone, lactogen, estrogen and so on, resulting in swelling and pain, which is a phenomenon that occurs when the mammary glands are full of milk and development. If there is a lump or pain in your breasts, and you are not breastfeeding, you should go to the hospital as soon as possible.