Just as with any other organs, the lower intestinal tract can be affected by a condition known as ischemia. This happens when an organ is deprived of the oxygen it needs to survive. Just as we need oxygen to breathe, every organ, in fact every cell in our body, needs oxygen just as we do. If blood flow to an organ is compromised that organ will also suffer from a decrease in needed nutrients as well as a buildup in detrimental waste products. It will, in effect, starve to death in its own detritus.