Common causes of Back Pain:
Pain Relief for back pain is possible with the right product or treatment. Most people with back pain do not have any damage to their spine. The pain comes from the muscles, ligaments and joints. More persistent back pain may be associated with arthritis of the facet joints and degeneration of the discs. People with this condition may however not experience any pain. Some common causes of back pain include: 

Arthritis - Like other joints of the body, the spinal facet joints can develop arthritis. There may be degeneration and inflammation within the joint and the growth of bony spurs (osteophytes) on the edges of the vertebrae. Commonly arthritis of the facet joints is associated with disc degeneration. Some forms of inflammatory arthritis such as ankylosing spondylitis directly involve the spine.
Muscle and ligament strains - weak muscles and ligaments are unprepared for sudden or heavy lifting loads and are easily injured. Lifting a heavy load without proper lifting techniques or back support, an unusual bout of exercise, or even bad posture over a period of time can hurt soft tissue and can result in back pain.
Osteoporosis - vertebral fracture due to osteoporosis. Osteoporosis is a disease characterised by thinning of the bones. The vertebrae can become so porous and brittle that they easily fracture. Back Pain is due to the fracture.
Sciatica - the nerve that runs from the lower back into the leg is compressed by a bulging intervertebral disc, causing back pain.
Stress - one of the side effects of stress is increased muscle tension, which can lead to fatigue, stiffness and localised pain. Constantly tight muscles can create postural imbalances that may cause misalignment of the spine and also back pain