More than 31 million Americans experience back pain at any given time. Over 80% of Americans will experience some form of back pain at some time during their lives. The back is made-up of 24 vertebrae plus the sacrum and coccyx, 24 ribs, many joints, ligaments and muscles which can be sprained, strained or irritated resulting in back pain. Sports injuries or accidents often cause back pain, but sometimes the simplest of movements can have painful results. In addition, arthritis, poor posture, obesity, and psychological stress among other things can cause or complicate back pain. Back pain can also be a result of disease of the internal organs, such as kidney stones, kidney infections, gallstones, blood clots, or a loss in bone density.