The reason why you feel cold in your legs after suffering from a lumbar disc herniation is mainly due to the characteristics of the lumbar disc herniation. When a lumbar disc is herniated, the herniated lumbar disc may compress the dural sac, the nerve root, or both. When a herniated lumbar disc compresses a nerve root, it causes abnormal sensation in the skin of the area for which that nerve root is responsible. Not only is there pain and numbness in the skin, but also abnormal pain and temperature sensation in the skin. Once the pain and temperature sensations are abnormal, the skin in the area of compression may feel cold or hot. Therefore, a herniated lumbar disc can cause the symptoms of coldness in the legs.