The reasons why children always have calf pain include the following: 1, caused by children’s growing pains, the causes of growing pains are complex, mainly due to the rapid growth of children’s bones, the tendons around the bones are relatively slow to develop, which will cause calf pain, and can be treated with calcium supplementation; 2, caused by children suffering from osteosarcoma and other causes of symptoms. If the child has osteosarcoma and other diseases, it will also cause calf pain, and calf pain will gradually aggravate, you can give the child a timely x-ray of the calf area to assist in diagnosis. If osteosarcoma is diagnosed, the child should be seen by an oncologist in a timely manner.