Teenagers running facing bone and medial side pain may be due to trauma, over exercise, fatigue osteochondritis and other reasons. 1. Trauma: the most common cause of running pain is local abrasion, sprain and extrusion during running, which leads to tibia injury and lower leg pain on the facing and medial side of the leg. 2. Excessive exercise: pain in the facing bone and the medial side may also be caused by excessive exercise, such as high-intensity jumping and running, the fascia and periosteum of the facing bone are repeatedly stretched, forming edema, which leads to the symptoms of pain in the facing bone and the medial side. 3. Fatigue osteochondritis dissecans: If the pain in the facial bone and the medial side of the tibia is caused by running, it may be caused by fatigue osteochondritis dissecans of the tibia. The contraction and pulling of the muscles in the facing bone position leads to active cells in the periosteum, which is mainly manifested as subperiosteal hemorrhage, pain and discomfort, and other symptoms. When teenagers have running pain on the facing bone and the medial side, parents should take their children to the hospital in time, and choose the effective way to relieve the treatment.