There are many causes of leg pain in children, which can be categorized into two types, one is physiological and one is caused by disease. Physiological leg pain refers to growing pain, which is the most common cause of leg pain in children, mostly in children aged 5-10 years old, because at this age children’s bones grow rapidly, faster than the speed of muscle growth, so the muscle pulling pain is produced, growing pain mostly occurs at night or before bedtime, the duration is not long, mostly a few minutes to ten minutes, generally not more than 1 hour, massage, hot compresses can be relieved, more rest, avoid excessive exercise, appropriate supplementation of trace elements pain can also be relieved, The pain can be relieved by massage and hot compresses, more rest, avoiding excessive exercise, and moderate supplementation of trace elements, and will disappear naturally as the child gets older. Many diseases can also cause leg pain in children, such as traumatic fractures and dislocations, rheumatic diseases (rheumatoid arthritis, rheumatic fever, etc.), arthritis, bone tumors or certain blood diseases, etc. These leg pains can cause different pain areas, pain patterns and accompanying symptoms, which require professional examination and treatment in hospitals. Parents are advised to take their children to orthopedics and pediatrics departments in a timely manner, to conduct relevant examinations to clarify the cause and to treat the symptoms.