HELP I work 12 hrs & when I stand for period of time my lower bak start to hurt real bad & wen I walk it hurt worser & tighten up why? Wat 2take 4 It

Strains or Sprains. of the back muscles. Strains and sprains often heal on their own with home remedies, such as rest, ice and/or heat, gentle stretching and anti-inflammatory medication. Ice is generally used to reduce inflammation and swelling, while heat can help reduce muscle spasms.