Numbness in one leg is mainly due to two reasons: First, due to lumbar disc herniation or nerve root canal stenosis in the lumbar region, resulting in continuous pressure and stimulation of the nerve roots in the lumbar region, when the nerve bundles inside the nerve roots, due to the herniated disc or nerve root canal stenosis, resulting in ischemia of the nerve fibers, numbness will appear within the distribution of the corresponding lower branches, and the symptoms of numbness will appear when sitting for a long time, bending and lifting heavy objects When sitting for a long time, bending and lifting heavy objects, and overexerting the lumbar region, the symptoms of numbness will be further aggravated. After resting, especially bed rest, keeping the lumbar area warm will help reduce the numbness. Second, the pear-shaped muscle syndrome, because the pear-shaped muscle of the hip area has nerves passing through it, when the nerve inside, that is, the sciatic nerve is overly squeezed, stimulation, will cause nerve bundle ischemia, will appear in the distal leg symptoms of numbness. Especially when the hip joint is externally rotated, or the pear-shaped muscle is strained or pulled by the inward movement, it will lead to further aggravation of ischemia and numbness.