Is your back sore? Are you suffering from sciatica pain? Do you experience tense back muscles or back muscle spasms? You're hardly alone. An estimated eight out of ten American adults will experience back pain at some point in their lives, reports the American Chiropractic Association, with back pain ranking as the number-one cause of disability in the world. Instead of relying on over-the-counter pain medications to get by, and before you turn to more invasive procedures like lumbar surgery, you may want to give inversion tables a try.