imÂ·meÂ·diÂ·aÂ·cy. n. pl. imÂ·meÂ·diÂ·aÂ·cies. 1. The condition or quality of being immediate. 2. Lack of an intervening or mediating agency; directness: the immediacy of live television coverage. 3. Something immediate, as in importance.
Back pain is accompanied by weight loss, fever, chills or urinary symptoms. You develop sudden weakness, numbness or tingling in a leg. You develop numbness in the groin or rectum or difficulty controlling bladder or bowel function. You have had cancer previously and you develop persistent back pain.
Nerves in the low back supply sensation and power the muscles in the pelvis, legs, and feet. Most acute low back pain results from injury to the muscles, ligaments, joints, or discs. The body also reacts to injury by mobilizing an inflammatory healing response. While inflammation sounds minor, it can cause severe pain.