Causes of Pain in the Lumbar Spine (i.e. lower back)
There are many causes of lower back pain. The most common causes are:
Muscular Problems
Degenerated discs
Lumbar Disc Herniation (diskbråck)
Sacroiliac Joint Dysfunction (IS Joint Pain)
Spondylolisthesis (kotförskjutning)
Osteoarthritis (artros)
Lumbar Stenosis (förträngning i ryggraden)
Read more about them in detail on http://www.spine-health.com/conditions/spine-anatomy/causes-pain-lumbar-spine