Coldness in the legs below the waist can be caused by a variety of reasons, including vascular problems, herniated lumbar intervertebral discs compressing the nerves, and so on. 1. Vascular problems: If you feel cold in your legs and the skin of your legs feels low, you should consider vascular problems, such as arterial embolism, which causes insufficient blood supply to the legs and low skin temperature. 2. Nerve compression: If you feel cold in both legs, but the skin temperature of your legs feels normal and symmetrical, consider lumbar disc herniation and nerve compression, causing abnormal skin sensations such as coldness in the legs. The feeling of coldness below the waist can also be seen in other causes, it is recommended to go to the hospital in time, combined with their own symptoms and laboratory imaging, to clarify the cause of the diagnosis, so as to avoid delaying the condition.