Lower back pain on one side that sometimes goes into the leg is most commonly due to muscle strain or irritation of a lumbar nerve root, often from prolonged sitting, poor posture, lifting weight, or a minor disc problem.
Next Steps
Avoid prolonged sitting and bending forward
Use proper back support while sitting
Apply hot fomentation to the lower back 3 times daily
Do gentle back strengthening and stretching exercises
Take pain relief medication after consulting with an orthopaedic surgeon.
Health Tips
If the pain persists for more than 2 weeks, increases,or is associated with numbness, tingling, or weakness in the leg, you should consult an orthopaedic or spine specialist for examination and may require an MRI of the lumbar spine.