Men and women are equally affected by lower back pain, and most back pain occurs between the ages of 25 and 60. However, no age is completely immune. Approximately 12% to 26% of children and adolescents suffer from low back pain. Fortunately most low back pain is acute, and will resolve itself in three days to six weeks with or without treatment. If pain and symptoms persist for longer than 3 months to a year, the condition is considered chronic.

Humans are born with 33 separate vertebrae. By adulthood, most have only 24, due to the fusion of the vertebrae in certain parts of the spine during normal development. The lumbar spine consists of 5 vertebrae called L1 through -L5. Below the lumbar spine, nine vertebrae at the base of the spine grow together. Five form the triangular bone called the sacrum. The two dimples in most everyone's back (historically known as the "dimples of Venus") are where the sacrum joins the hipbones, called the sacroiliac joint. The lowest four vertebrae form the tailbone or coccyx.

The anatomy of the spinal column is extremely well designed to serve many functions. All of the elements of the spinal column and vertebrae serve the purpose of protecting the spinal cord, which provides communication to the brain, mobility and sensation in the body through the complex interaction of bones, ligaments and muscle structures of the back and the nerves that surround it. The back is also the powerhouse for the entire body, supporting our trunks and making all of the movements of our head, arms, and legs possible.