The symptoms of left-sided back and leg pain are as follows: 1. It may be due to the greater force on the left side of the waist and the greater force on the left side of the legs, resulting in excessive tension and fatigue of the muscles and soft tissues of the left side of the waist and legs, resulting in strain, causing painful symptoms on the left side of the waist and legs. 2. The main symptom is the pain in the legs after walking for a while, which will improve significantly after resting, and the pain will appear again after continuing to walk for a while, which is called intermittent claudication. 3, the symptoms of left-sided lumbar leg pain may also be caused by lumbar disc herniation, and the protruding disc will produce extrusion stimulation to the nerve roots of the lumbar region, when the left lumbar disc After the protrusion of the left lumbar disc, it will produce extrusion and stimulation of the left lumbar nerve root, resulting in pain symptoms in the left leg, mainly radiating pain, and sometimes soreness and other symptoms.