The coldness of lower limbs after varicose vein surgery done by laser may be a normal phenomenon, or it may be caused by atherosclerosis of lower limbs, lumbar intervertebral disc herniation and so on. 1. Normal phenomenon: cold lower extremities after laser varicose vein surgery may be normal, because the local soft tissues and vascular tissues are gradually recovering after the surgery, so the symptom of cold lower extremities will occur, and it is recommended that the patient should do a good job of postoperative measures to keep warm, which can help to ease the discomfort. 2. Lower extremity atherosclerosis: If patients suffer from lower extremity atherosclerosis, the blood vessels in the lower extremities may narrow, resulting in poor blood circulation, which may also lead to symptoms of cold lower extremities. 3. Herniated lumbar intervertebral disc: If the patient suffers from herniated lumbar intervertebral disc, the vertebral canal may be compressed and accompanied by numbness, pain and other symptoms, so it will feel the phenomenon of cold lower extremities. It is recommended that patients should take measures to keep warm after the operation, and should go to the hospital in time if they have other uncomfortable symptoms.