Heart's main function is to pump blood and supply oxygen and nutrition to each and every body cell. Heart muscles also needs blood and nutrition to work. The tubes that supplies blood to heart muscles are called as Coronary Arteries.
After the age of 18 Years whatever excess fat we consume, gets deposited in our body at various places at face, neck, stomach, thighs, back, and heart blood tubes and forms blockage.
The problem starts when blockage deposition occurs in heart arteries. After 60-70% of heart blockage we start feeling chest pain, heaviness, chest tightness, shoulder pain radiates to hands, jaw pain, back pain, uneasiness, dizziness, headache, sweating etc. these all symptoms collectively called as "Angina" and this disease is called as "Coronary Artery Disease" CAD or "Coronary Heart Disease" CHD.
Many times it happens that persons with prolonged history of diabetes may feel lees symptoms or may not feel any symptoms of coronary artery disease.
Heart blockage deposition starts from the inner wall of coronary artery. Blockage is covered by a membrane. It is called endothelial membrane. This membrane is elastic in nature. As the blockages increases this membrane starts stretching. After 60-70% of blockage this membrane may burst at any time. When the membrane burst, blockage comes in contact with blood and forms clot and becomes 100%. The bursting of this membrane is called as "Heart-Attack" or Myocardial Infraction" or Atherosclerosis.
The capacity if this endothelial membrane varies from person to person. It may burst in a 60-70% of blockage in a person and it may not burst till 90-95% of heart blockage in another person.