Unstable angina is a widely used term, in addition, worsening angina and each type of spontaneous angina is also known as infarct angina, ischemic heart disease has the following kinds of naming and criteria, will be divided into the following kinds of angina so that you can better differentiate! 1, exertional angina: due to physical activity, emotional excitement and other reasons, resulting in increased myocardial oxygen consumption, thus inducing angina. When the patient is emotionally stable, rest in place or tongue medication, the symptoms can be relieved. 2, stable angina: exertional angina has the same number of attacks, pain level, time, location and triggers within 1 to 3 months, and the symptoms can be relieved after rest or medication. 3, worsening angina: stable angina patients in three months the frequency, duration of pain, triggering factors and other frequent changes, and constantly worsening is classified in this category. 4, acute coronary insufficiency: mostly occurs at rest or during sleep, lasts from half an hour to more than an hour, and is often considered a precursor to myocardial infarction! 5.Mixed angina: Most patients have anterior heart pain caused by insufficient blood flow reserve due to coronary artery stenosis.