Tennis elbow is the common term for a condition called lateral epicondylitis. Overuse of or strain in the forearm can cause inflammation of the tendon that attaches the forearm muscles to the bony protrusion on the outer part of the elbow joint. A side-to-side curvature of the spine is called scoliosis. This is different from a curvature of the upper spine that causes a hunched back (called kyphosis, or dowagers hump). Kyphosis is most often caused by the bone-thinning disease osteoporosis.