This is a clinical syndrome of episodic chest discomfort due to transient myocardial ischemia. In most cases, angina is just a symptom of many other diseases such as aortic valvular disease and obstructive hypertrophic cardiomyopathy. It is more common in males in the range of 40-60 years. The pain of angina is triggered by exertion and relieved by rest or sublingual nitrate. Angina is of two types- stable and unstable.
Coronary atherosclerosis is the main cause of it. It occurs due to the narrowing of the coronary artery due to intramural plaques as a result of atherosclerosis and causes ischemia due to the reduced blood supply and result in pain.