The duration of angina is generally 3-5 minutes, the details are as follows: 1. The onset of angina is a clinical syndrome caused by acute, temporary ischemia and hypoxia of the myocardium after insufficient blood supply to the coronary arteries of the heart. The main manifestation is paroxysmal anterior chest crushing-like pain sensation, feel suffocated, panic, like a large stone pressed in the chest position, mainly located in the back of the sternum, can also spread to the precordial area and the back of the shoulder, the attack is usually caused by exertion, emotional excitement, binge drinking, overeating and other reasons; 2, the symptoms often gradually aggravated after the appearance of a certain degree of persistence for a period of time, and then gradually disappear. Angina usually lasts for a few minutes to more than ten minutes, mostly 3-5 minutes, rarely able to exceed half an hour, and does not suddenly disappear or last for hours, often patients can relieve themselves after rest, if sublingual nitroglycerin, will also be quickly relieved. If the coronary heart disease is more serious, can be several days or weeks an attack, can also be a day within a number of attacks; 3, if the angina symptoms attack more than 20 minutes still do not relieve, and gradually aggravated or sublingual nitroglycerin also did not relieve, need to consider is myocardial infarction, to immediately go to the hospital rescue, can not delay, time is life, the heart muscle also need to be well protected.