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Lower back pain can be caused by a variety of problems with any parts of the complex, interconnected network of spinal muscles, nerves, bones, discs or tendons in the lumbar spine. Typical sources of low back pain include: 1  The large nerve roots in the low back that go to the legs may be irritated.
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.