Coldness on the back of the hands may be caused by factors such as low ambient temperature, narrowing or occlusion of peripheral blood vessels, and hypoglycemia. 1. Low ambient temperature: Staying in a low temperature environment for a long time will cause the blood vessels on the back of the hand, where the skin is weak, to shrink and the blood circulation to slow down, thus causing coldness on the back of the hand. 2. Narrowing or occlusion of peripheral blood vessels: When the peripheral blood vessels on the hands are narrowed or occluded, the blood supply to the back of the hands will be affected, resulting in the symptoms of cold hands. 3. Hypoglycemia: Skipping breakfast in the morning or prolonged starvation can lead to hypoglycemia, which can cause poor microcirculation and blood circulation, and then the back of the hand is cold. If the symptoms of cold hands and back cannot be relieved for a long time, you need to go to the hospital for consultation and treatment as soon as possible.