This document discusses low back pain, providing an overview of its prevalence, causes, diagnostic approach, and management. It addresses the most common structures involved, including the skin, muscles, bones, discs, spinal cord, and visceral organs. Common etiologies are degenerative changes, infections, developmental abnormalities, trauma, and tumors. The diagnostic approach involves history, physical exam focusing on inspection, palpation, range of motion testing, and neurological exam, as well as imaging and lab tests. Treatment depends on the underlying cause but may include medications, physical therapy, injections, or surgery.