Thanks for your query. In kids back pain is not a common complaint. More often it is non specific and related to poor posture or undiagnosed muscle sprain from a minor fall or tripping over. But in nearly half of kids a specific or serious cause will be found. Pain that occurs on a daily basis,worsening,wakes him from sleep,associated with fever are some of the warning features. He needs a detailed physical examination & certain tests like CBC,CRP,ESR & MRI spine. Hope you found the information useful.