Lower back pain, including pain in goin and numbness in leg.

See a doctor: Back pain involving multiple symptoms, or spreading / radiating to other areas should be evaluated to make sure something is not pressing on a nerve or nerve root or if soemthign else is causing the regional as well as local pain. Multi-symptom back pain usually requires medical evaluation for diagnosis.

Should improve: Fortunately these symptoms are common for people to experience at least once in their life. The symptoms often resolve within a few weeks to a month or so. If there is any leg weakness or bowel or bladder incontinence then you need to get checked out. You are describing radiculopathy or commonly called sciatica. Treat the pain with motrin/aleve. If this does not help then see your doc.

There could be : Several reasons for this pattern including disc &/or facet(spine joint) degeneration with or without some instability & with or without associated narrowing or stenosis of nerve exit holes (neuroforamen ) or due to a possible disc herniation. If it persists or worsens, you may need a more thorough evaluation for diagnosis & appropriate treatment. Other possibilities include pyriformis syndrome.