How severe is angina pectoris?

Angina exercise-related is

a type of angina pectoris that falls under the category of coronary artery disease and is caused by increased oxygen consumption by the heart during strenuous exercise or emotional agitation. In the occurrence of exertional angina pectoris, in addition to chest crushing pain, chest distress and other discomfort, due to severe myocardial ischemia, arrhythmia, acute myocardial infarction or sudden death may occur, which has a certain threat to life, so it is more serious.