The 10-year-old girl breast side hard lump, a touch also pain is what is going on, it is generally believed that 10-11 years old is the early stage of breast development, so the breast hard lump, generally speaking is the breast has begun to develop, so some children will feel, a touch will have some pain, this is a normal physiological phenomenon do not be nervous. With the development of women slowly will gradually disappear, no matter. But we should pay attention to the usual life, on the one hand, that is, whether the child is studying or living, do not be too much pressure to reduce stress, to ensure adequate sleep. On the other hand, try to eat less food containing more hormones and eat more food rich in protein and vitamins.