Numbness and coldness in the legs, the common causes are as follows: 1, lower limb vascular lesions: such as narrowing of the arteries in the lower limbs, or multiple plaque formation, can lead to insufficient blood supply to the legs, the nerves will show local numbness after the lack of nutrition, the reduction of blood supply will make the legs cold, so there will be clinical symptoms of numbness and coldness, through the ultrasound examination, will find the lesions and the degree of lesions in the blood vessels. 2, intervertebral disc herniation and Spinal stenosis: If it is more serious, it will make the nerve edema, and the nerve will be highly sensitive will show clinical symptoms of numbness and chills, mainly in the legs easily. Patients will also have lumbar spine pain and limited lumbar spine movement, and the muscle strength of the lower extremities will gradually diminish. Early diagnosis and treatment can lead to complete relief of the clinical symptoms of numbness and coldness in the legs.