For spine diagnostics, MRI is necessary...Ensure that he maintain an appropriate posture while working or sitting or walking....Take frequent stretch breaks and drink lots of water...Discontinue using pillow while sleeping straight...Do not lift heavy objects, especially after bending down....Eat a healthy wholesome meal which should satisfy his minerals and proteins requirement...take over the counter pain medications.. Consult nearest orthopedic surgeon they will do the needful.

Hello. Back pain can be due to various reasons, both orthopedic, neurological or rheumatological. Follow up with a rheumatologist or a neurosurgeon, as thorough examination is needed to advise for necessary investigations. Hope this helps.