Children’s calf pain may be related to trauma, tumors and other diseases, but also may be related to physiological factors. Children are active and active, causing calf pain mostly related to trauma. For example, after a fall, the calf soft tissue muscle ligaments strained, resulting in soft tissue swelling caused by pain. If the injury is large, it may cause fracture, such as calf green branch fracture, etc., which will cause severe pain and activity limitation. Tumors of the calf, such as osteochondroma, occurring in the upper part of the calf, can also cause pain when the chondroma is large and compresses the surrounding tissues. Malignant tumors of the calf, such as osteosarcoma of the tibia, can also cause pain when the tumor presses on the bone. Children’s excessive activity, calf muscle fatigue can also cause physiological pain, usually after rest can be relieved. If the child’s calf pain symptoms, it is recommended that the patient go to the hospital for medical examination, to clarify the cause of the disease, and receive regular treatment.