The term "lumbar" refers to the lower part of the back, specifically the region of the spine that consists of five vertebrae, labeled L1 to L5. This area is crucial for supporting the upper body and allowing for a range of movements, such as bending and twisting. The lumbar spine is also a common site for back pain due to its weight-bearing function and the stress it endures during daily activities. In anatomy, the lumbar region is located between the thoracic spine, which is the upper back, and the sacral region, which is the base of the spine. The lumbar vertebrae are larger and stronger than those in the thoracic region, providing stability and support. Conditions affecting the lumbar area can include lumbar disc herniation, sciatica, and lumbar strain.