Left leg, foot numbness, this situation exists for a variety of reasons: 1, lumbar disc protrusion: when the protruding disc tissue compresses the nerve root, it can cause radiating pain in the lower limbs and numbness in the foot. 2, pear-shaped muscle syndrome: pear-shaped muscle syndrome is often due to sciatic nerve compression by abnormal pear-shaped muscle fibers, resulting in sciatic nerve pain. The pain can radiate all the way to the foot and is accompanied by numbness in the foot. 3, diabetes: advanced diabetes will appear peripheral neuropathy, often manifested as numbness in the hands or feet, numbness feels like wearing gloves and socks. 4, lumbar spinal stenosis: lumbar spinal stenosis will appear typical intermittent claudication, pain in the lower limbs and numbness in the foot when walking.