Hi Thank you for your question to HCM. Sedentary lifestyle over long period of time can lead to muscular back pain. In my opinion your son is likely suffering from muscular back pain. He will need physiotherapy comprising of muscle relaxation and strengthening of weak muscles. For the exact type of exercises he will need examination by a physiotherapist. Local analgesic gels and antiiflammatory medicines like ibuprofen will also help for pain relief. Spondylolysis is a break in part of the bone of vertebra and is one of the causes of back pain in adolescents but related more to activity than sitting. Also this is not as common as muscle related causes of pain so it is worth trying therapy first. If the pain is increasing despite all above suggested measures consultation with orthopaedic surgeon for further imaging will be required. Hope this is helpful. I would be happy to answer any questions. My best wishes for Aditya s future.