The pain in the leg bone of children may be due to trauma, growing pains, calcium deficiency factors. 1. Trauma factors: small children are more playful by nature, the appearance of pain in the leg bone area, do not rule out that it is due to collision and trauma and other factors, usually there will be a clear history of trauma. 2. Growing pains: If a child’s leg bone pain is bilateral symptomatic, and localized redness and swelling, no other manifestations, but also need to be highly suspicious and growing pains. 3. Calcium deficiency factor: small children who often picky eating partial food, do not pay attention to the balanced nutrition of the diet, may be in the body of calcium and vitamin D deficiency, thus causing the symptoms of leg bone pain. Children with leg bone pain, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.