Maybe you've never heard of subluxations.
There probably was a time when you'd never heard of AIDS or Alzheimer's.
You have more than 200 bones in your body. Whenever two bones come together at a joint, there can be movement.
Since joints in your spine are so close to your spinal cord and nerve roots, too much or too little joint motion can have serious effects. If spinal bones get "stuck" and don't move right, they can irritate or chafe delicate nerves.
If a joint moves too much, spinal bones can press against adjacent nerve tissue. This can interfere with the vital "life force" transmitted over your nervous system that helps keep your brain in touch with your body.
The result is the vertebral subluxation complex, or more simply, a subluxation. More than bones and nerves are involved. Muscles can become too tight or too weak. Discs, ligaments and other connective tissues can become inflamed. Bone spurs and arthritic degeneration can set in.