Cold feet may be caused by physiological reasons such as temperature difference, or it may be caused by vascular diseases of the lower limbs, lumbar diseases and other pathological reasons. 1. Physiological reasons: after a lot of exercise, there will be more sweat oozing out of the feet, if the surrounding temperature is relatively low, in the case of less than zero degrees Celsius, the feet and the surrounding environment will form a temperature difference, resulting in the direct liquefaction of sweat into a gas, manifesting itself as the feet of the gas, which is a normal physical phenomenon, without any treatment. 2. Pathological reasons: the lower extremity blood vessels or nerves innervating the foot lesions, there may also be cold feet. For example, varicose veins in the lower limbs, diabetic foot patients, etc., will affect the blood flow of the lower limbs, appearing cold feet; lumbar intervertebral disc herniation or spinal stenosis compression of the nerves, will cause sensory abnormalities in the lower limbs, the patient will also have a feeling of cold feet. Based on the symptoms of cold feet alone can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results in order to make accurate judgments, it is recommended to clarify the cause of the disease under the guidance of a doctor.