If any one of the three blood vessels is completely blocked , then heart attack occurs. If the blood vessels are closed slowly for a long time , then heart attack may not occur , but if it closes suddenly, heart attack will occur. In many people, fat accumulates in the blood vessels and the blood vessels become narrow. As a result, blood supply to various organs decreases. Whether or not a blood vessel will suddenly close depends on the type of lining inside the blood vessel . When the inner lining ruptures, blood clots form there and completely stops the supply of blood vessels. As a result, the heart muscle starts to deteriorate and this is called heart attack. However, if the blood vessels can be opened within eight hours , then it is possible to protect the heart muscle. Studies have shown that various factors are responsible for rupture of the lining of blood vessels , such as: Excessive work , which the body is not accustomed to. Excessive eating and physical exertion after eating. অতিরিক্ত Excessive smoking together. Insomnia. Excessive anxiety. Sudden excitement or anger. Any kind of infection in the body.