More than 30 million Americans experience back pain from time to time. Causes of back pain range from mechanical problems, like your posture, to acquired conditions, like osteoporosis or arthritis–including a severe form of arthritis called ankylosing spondylitis (AS). AS is a hereditary immune disease that’s more commonly found in men. AS usually appears in the form of back pain and stiffness, but it can eventually lead to a fusion of vertebrae, which can handicap movement, mobility and flexibility. If your back pain does not subside, be sure to see your doctor to rule out serious conditions like AS. In the meantime, try these solutions to alleviate the stiffness and pain.