The main causes of cold feet include peripheral vascular diseases and lumbar diseases. 1. Peripheral vascular diseases: mainly including vascular occlusive vasculitis, atherosclerotic occlusive disease, arterial thrombosis of the lower extremities, diabetic foot and other diseases, peripheral vascular diseases may cause spasm, stenosis or blockage of blood vessels of the lower extremities, resulting in lower extremity blood circulation disorders, peripheral vascular ischemia, hypoxia, and the emergence of the symptom of cold feet and back. 2. Lumbar diseases: mainly including lumbar disc herniation, lumbar spinal stenosis, intravertebral canal tumors and other diseases, lumbar diseases may cause spinal nerve roots and spinal nerves within the spinal canal compression, nerve compression produces damage or irritation, resulting in abnormal sensory nerves innervating the dorsal region of the feet, and then uploaded to the cerebral cortex through the spinal cord, then the feeling of a cold dorsum of the feet will occur. It is not possible to determine the cause of the coldness of the back of the feet alone, but it is necessary to combine the characteristics of the medical history and other test results to make an accurate judgment, and it is recommended to clarify the cause of the disease under the guidance of a doctor.