If you are 8 years old and your breasts are swollen and painful, it may be due to precocious puberty or trauma. 1. Precocious puberty: pay attention to observe whether there is the appearance of breast lumps, if the appearance of breast lumps accompanied by a painful feeling, then it may be the appearance of precocious puberty. At the same time, it may be accompanied by other changes in secondary sexual characteristics, such as skin becoming delicate and smooth, and subcutaneous fat becoming thicker. 2. Local trauma: If the child’s breast position is hit by external forces, it is possible to cause pain in the breast, and severe may also be accompanied by localized redness and swelling and other symptoms of discomfort. There may be other reasons for the girl’s 8-year-old breast pain, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment. All of the above medications should be used under the guidance of a doctor.