There are various causes of chest pain in girls, mainly: first, cystic hyperplasia of the breast, which occurs in women of childbearing age, because of endocrine hormonal changes leading to excessive glandular hyperplasia and degenerative lesions incomplete, clinical manifestations are mainly breast swelling and pain, accompanied by the formation of hyperplastic nodules, and the degree of pain and nodule size before menstruation, and after menstruation can mostly be relieved; second, acute mastitis, common in lactating women, as In the early stage of infection, there is only breast pain and increased local skin temperature in the breast, but when the infection is further aggravated, breast abscess can appear, which is manifested as a fluctuating lump palpable in the breast; thirdly, breast malignant tumor, which often has no characteristic performance in the early stage, but when the disease progresses to the advanced stage, there can be dull pain in the breast or the tumor invades the subcutaneous lymphatic ducts, causing obstruction of lymphatic flow. When the disease progresses to advanced stage, dull pain in the breast or tumor invasion of subcutaneous lymphatic ducts may appear, causing obstruction of lymphatic flow and orange peel sign. Therefore, if a girl has chest pain, she should go to a regular hospital for breast surgery to clarify the cause of chest pain and get timely treatment.