Lumbar spine disorders refer to a range of conditions that affect the lower part of the spine (the lumbar region), which consists of five vertebrae (L1 to L5) and the associated discs, nerves, muscles, and ligaments. These disorders can lead to pain, reduced mobility, and in some cases, more serious issues like nerve compression. They are common in both older adults and younger individuals, often due to factors such as injury, degeneration, or overuse.