Children often say leg pain should be mainly considered as growing pains, but also may be caused by trauma, synovitis and other conditions. 1. Growing pains: Children’s bones are in the stage of growth and development, and the muscle tissue is in a highly tense state, which is prone to pulling pain. At the same time, children’s calcium needs are greater, and the lack of calcium also tends to lead to nerve excitation, which causes muscle spasms and frequent pain. 2. Trauma: children in ordinary life accidentally collided with the legs, or legs hit by external forces can cause leg pain, but also can be accompanied by bleeding, bruising and other symptoms. 3. Synovitis: can be caused by cold, trauma and other reasons, will produce sterile inflammation; open trauma can lead to synovial membrane infection, thus causing inflammation and pain. Children often say leg pain, may also be caused by other reasons, parents can take the child to the hospital for examination, clear diagnosis and follow the doctor’s instructions for relevant treatment.