If a 10-year-old girl has hard lumps and pain in her breasts, the first thing to consider is that the child’s breasts are starting to develop, and hard lumps and pain in the breasts are a sign of early development. The development of secondary sexual characteristics in girls gradually begins to improve as the child gets older, and the more obvious manifestation is the development of breasts after puberty. At the beginning, the nipple and the appearance of the breast usually change, and a hard node can be felt inside the breast, and there will be swelling and pressure pain when pressed, which is normal, and in most cases will disappear slowly with age. If the pain is significant or heavy, there may be a nodule or lump in the breast, such as a breast fibroid, which requires an ultrasound test at the hospital to determine if there is a lesion in the child’s breast, but this is less likely to occur in 10 year olds. When it is determined that the child’s breasts begin to develop to pay attention to the protection of the child’s breasts, try to avoid the extrusion or collision of external forces, you can wear a suitable corset, but also so that the breasts can be properly protected, to reduce the damage caused by sports and breast pain, and at the same time to do a good job of psychological guidance to the adolescent children, do not because of the development of low self-esteem, to create a good environment for breast development.