The child suddenly said thigh root soreness, consider may be thigh root muscle injury, growing pains, infections and other causes, it is recommended to observe the sore parts there is no redness, swelling, pressure, trauma and other factors, as soon as possible to go to the hospital to find out the cause of the disease, according to the cause of the treatment. 1. Muscle injury: children play fun, love sports will cause muscle soreness. If you do not have a lot of exercise and the thigh root soreness and pain is serious, it is recommended to go to the hospital in time to check, exclude bone lesions, so as not to delay the treatment time. 2. Growing pains: children’s greater activity, and rapid bone growth and development, and local muscle and tendon growth and development is not coordinated, resulting in growing pains. Growing pains generally do not need special treatment, when the pain is severe, you can local massage, hot compresses, dietary attention to calcium and vitamin D supplement. 3. Infection: children after trauma local infection may appear pain, and accompanied by local redness, swelling, pressure pain, skin temperature rise and other manifestations, need to be timely anti-infection treatment. If the child’s thigh root pain is severe and recurrent, it is recommended to consult a doctor in time to identify the cause of the disease, under the guidance of the doctor for treatment, to avoid adverse consequences.