The possible causes of chest pain during puberty include tight underwear, breast hyperplasia, and breast tumors. 1. Too tight underwear: adolescent girls who wear a bra for too long or too tightly will have their breasts locally compressed, leading to poor blood circulation, which in turn will cause slight pain and discomfort when the nipple area is pressed. 2. Breast Hyperplasia: It is a benign hyperplastic disease of the breast parenchyma formed during the development of female breasts. It will cause pain when pressing on the breast area. 3. Breast tumor: refers to the tumor that occurs in the breast tissue. If there is a breast tumor, not only will there be obvious pain when pressing, but also there will be obvious hard lumps and lumps locally. There may be other reasons for breast pain during puberty, so it is recommended to go to the hospital in time for examination to find out the cause of the disease, and treat it according to the specific situation.