Pain left side of lower back, above buttock. Radiates intermittently into groin and when it does, v painful. Eases with nurofen, worse on rest. Cause?

Radiculopathy. refers to pain or other symptoms that occur in a location supplied by a nerve, when the problem occurs at or near the root of the nerve, shortly after its exit from the spinal cord. Radicular pain in the groin results compression or irritation of a spinal nerve root in the upper lumbar spine (low pain). This can result from inflammation surrounding the nerve root. Nuprofen reduces inflammation.