more than 100 causes of low back pain have been cataloged by medical scientists, but identifying the specific culprit in any one patient often is difficult. As a result , most cases of low back pain are labeled idiopathic ( of unknown origin)
Doctors do know that most back pain results from having bad “back habits” and being in poor physical shape.
Standing, sitting, bending, or lifting objects the wrong way can contribute to low back pain. Having a condition known as swayback (increased curvature of the lower spine) also can place an excessive strain on the lower back. So can being overweight. The result is muscle fatigue, cramps, or spasms.
Other leading causes of back problem are
Injuries resulting from fracture of any bone supporting the back as well as sprains that occur when muscles or ligaments are torn or stretched.
Degenerative changes, which occur as the bones and disc of the spine being to deterioriate in young adulthood. By middle age, arthritis (inflammation of joints) and osteoporosis (softening of the bones) may limit movement and cause pain.
Emotional strees, which is thought to be the cause of many cases of low back pain. Like the stomch, the back is what doctors call a “psychosomatic target organ” Anger and anxiety tighten back muscles, which then may go into spasm, especially if they are weak.