What cause lower back pain ?

Many reasons: Local infection, muscular strain/ sprain, ruptured disc, facet impingement, spondylolisthesis, sacro-iliac dysfnctn, lumbar stenosis, cauda equina syndrome, pyriformis syndrome. See doctor and evaluate all of these possibilities.

Many causes: so need to see doctor to determine the cause.

Many Causes: Could be the muscles, ligaments, disc herniation, could be early onset arthritis (in young males you can have Ankylosing Spondylitis or Schuermann's Disease). Lots of possibilities, if it does not resolve with basic exercise and stretching see a spine specialist to work this up further.

Several options: Back pain is usually related to arthritic changes to the spine. Sometime back pain can be related to infections, cancer, fractures, or even other organs such as the kidney, bladder, etc. If your pain lasts greater than 2 weeks I would see your physician.

See below: The list of individual conditions is too long. We can basically divide causes into 3 broad categories: boney causes, muscular causes and nerve causes.

Weight: Over weight. Sedentary work and strenuous activity