If children feel fine during summer vacation or other breaks, but start complaining of pain in the back, shoulders, or neck once school is back in session, an overloaded backpack may be to blame, according to Saad B. Chaudhary, MD, MBA, Minimally Invasive Spine Surgeon at The Mount Sinai Spine Hospital and Assistant Professor of Orthopedic Surgery at the Icahn School of Medicine at Mount Sinai.