The right side of the thigh often appear a burst of numbness, the outer calf wood and cold may be related to the lumbar intervertebral disc herniation, lumbar spinal stenosis and so on. 1. Herniated lumbar intervertebral disc: When the intervertebral disc undergoes structural changes due to trauma or degenerative diseases, the nucleus pulposus can be detached from the ruptured annulus fibrosus, compressing the spinal cord and nerve roots and other tissues, which causes lumbar and leg pains and other symptoms, and when sensory nerves are pressurized, it can lead to numbness and coldness in the innervated area. 2. Lumbar spinal stenosis: Lumbar spinal stenosis refers to the decrease in volume and size of the lumbar spinal canal due to various reasons, which makes the spinal cord or the cauda equina nerve compressed, thus causing lumbar and leg pain, leg numbness, coldness and other symptoms, and in severe cases, urinary and fecal dysfunction can occur. The right side of the thigh often appear a burst of numbness, the outer calf numbness and cold can be caused by a variety of diseases, it is recommended to go to the hospital as soon as possible, timely treatment.