The right leg from top to bottom numbness, consider lumbar disc herniation, pear-shaped muscle syndrome, lumbar spinal stenosis and so on. 1. Lumbar disc herniation: Lumbar disc herniation is caused by degeneration of the lumbar disc fibrous ring partially or completely ruptured, the nucleus pulposus protrudes and presses on the nerve root, if the nucleus pulposus presses on the sciatic nerve, it will cause sciatic nerve pain, and there will be sensory abnormality, which will be reflected in the numbness of the right leg. 2. Piriformis syndrome: Piriformis syndrome is caused by traumatic injury to the piriformis muscle injury, repeated injury to the piriformis muscle hypertrophy compression of the sciatic nerve symptoms, the sciatic nerve is the back of the bone group of muscles, calf and foot muscles of the motor nerves, after the compression of the pain will also occur, and some will appear skin sensory abnormalities. 3. Lumbar spinal stenosis: Lumbar spinal stenosis is a narrowing of the lumbar spinal canal or intervertebral foramina caused by various reasons, which compresses the nerve root or cauda equina. If the nerve root is compressed, it may cause abnormalities of the sciatic nerve, which may be manifested as numbness of the right leg from top to bottom. It is recommended to go to the hospital for a detailed examination and treatment for the cause of right leg numbness from top to bottom.