Chest in the process of development will hurt, the specific reasons for pain are as follows: 1, puberty is a normal physiological phenomenon, the hormone levels in the body during puberty is not stable, resulting in breast swelling and pain in the puberty will disappear after puberty, boys and girls may have symptoms. 2, premenstrual syndrome, the girl’s breast development has three phases, this three phases include menstruation, menstruation, chest pain may be premenstrual syndrome, pain light can not be dealt with. When the pain is light, you don’t need to deal with it, but if the symptoms are heavy, you need to take medication to regulate it.3, chest trauma, if the chest is hit or compressed chest pain, if there is ecchymosis, you can massage, hot compresses, if there is a wound, you need to fight infection and stop bleeding, and the wound is big enough to need stitches.4, breast cancer, patients with genetic factors have a higher risk of developing breast cancer than normal, and they need to go to the hospital to check it out.