What is the reason for the stagnation of blood in some parts of the body and how to prevent such a phenomenon?

Blood congestion is a very dangerous phenomenon. This occurs in those tissues where blood does not circulate well. There, the blood loses its entire supply of oxygen and new blood cannot flow there. In fact, a part of the tissue appears that does not have oxygen. The process of unlocking the cells begins. If untimely identified, a person may lose part of the tissues, organ or body part. Such a process of blood stagnation can happen when the blood vessels are mechanically blocked, with the formation of blood clots and other processes that clog the vessels.