Back pain. Posterior view of the naked torso of a woman, her hand held to her aching lower back. Back pain (lumbago) usually affects most people at some stage of their lives. It is commonly caused by strain, resulting in temporary injury to soft tissues (such as tendons, muscles and ligaments) around bones of the spine. People who lift heavy objects, or those who spend long periods sitting in one position, are most likely to suffer from back pain. Treatment includes change of posture when resting or lifting objects, and taking pain- killing drugs. Severe or persistent back pain may indicate a more serious disorder such as arthritis or slipped disc.