The abbreviation for stable angina is SAP. stable angina is mainly associated with exertion, emotional stress, satiety, cold weather, and excessive physical activity, which usually causes radiating pain, pressure, and tightness in the forehead, back, left shoulder, and left arm, usually lasting from 10 seconds to 2-3 minutes, and rarely lasting more than 15 minutes or even half an hour. Once stable angina occurs, sublingual nitroglycerin is needed for prevention to prevent myocardial infarction. In addition, it is important to go to the hospital urgently to develop the next treatment plan based on various tests.