Blocks in blood vessels of the heart
These days many are worried about blocks developing in the blood vessels of the heart because it is one of the leading causes of illness and death. Most of the blocks in the blood vessels of the heart do not occur all of a sudden though heart attack is usually an abrupt event. Material which block the vessels including fat deposit develop over a long period of time, just like in an old rusted water pipe. This gradually decreases its lumen size, leading to poor blood supply to the region of the heart muscle supplied by it. But a vessel can get blocked suddenly when one which is partially blocked by fat deposit gets totally blocked by a clot forming over the partial block. This is often the mechanism behind a sudden heart attack, which can even be fatal.