Backache

Back pain can have causes that aren't due to underlying disease. Examples include overuse such as working out or lifting too much, prolonged sitting and lying down, sleeping in an uncomfortable position or wearing a poorly fitting backpack.

 Muscle or ligament strain. Repeated heavy lifting or a sudden awkward movement can strain back muscles and spinal ligaments. For people in poor physical condition, constant strain on the back can cause painful muscle spasms. Bulging or ruptured disks.