Numbness in one leg or foot is a precursor of lumbar disc herniation or pear-shaped muscle outlet syndrome. A herniated lumbar disc presses backward on the nerves in the spinal canal, resulting in radiating pain and numbness in the lower extremity areas innervated by the nerves, sometimes combined with low back and back pain. In addition, the hip outlet of the sciatic nerve (called the pear-shaped muscle outlet), which is repeatedly bent and sedentary, causes radiating pain and numbness in the lower extremity area innervated by the sciatic nerve due to the pressure. However, the pear muscle outlet syndrome does not combine with low back pain, so the above two factors should be considered and differentiated first.