There are several reasons one feels cold after hemodialysis. The main reason is that the blood is put through a filter outside the body and that lowers the blood temperature. Although the machine does warm the blood back up , it is important that the blood not get too hot and so it is a little cooler than normal body temperature. A second reason is that the dialysis centers are kept cold and patients must sit still for 3-4 hours during dialysis. A third reason is that most dialysis patients are anemic, which makes them easily chilled.