The pain on the right side of the lower back may be caused by lumbar sprain, lumbar disc herniation, kidney stone and so on. 1. Lumbar sprain: when the lumbar suddenly change posture or carry heavy objects sprained lumbar, can cause one side of the lumbar pain, accompanied by lumbar spine activities are limited. It can be alleviated by resting. 2. Lumbar disc herniation: If the nucleus pulposus protrudes to the side and compresses the nerve root on one side, it can cause low back pain on one side, accompanied by leg pain and numbness on the same side. This can be clarified by lumbar MRI. 3. Kidney stones: stones can cause pain in the lower back, more intense, colic, and accompanied by hematuria. Through the urinary tract ultrasound can be clearly diagnosed. The right side of the lower back pain if the pain is severe need to go to the hospital in time to check the diagnosis.