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Since you have leg pain, it could be spinal nerve affected in your lower back. You should have MRI.
How tall are you? How much do you weigh? Any weight change? On a scale of 0-10, what is the pain with 0 being no pain and 10 being the strongest pain? What is it like? Does anything make it better or worse? Does it radiate somewhere else? When you lean forward, is the pain better? Do you have numbness, tingling, weakness in your leg or both legs? When did it start? Is it consistent? Is it getting worse? Any other symptoms? Are you aware of anything else which might have triggered it? Any medical problems? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history?