Acute myocardial infarction seriously endangers people’s lives. Before the attack, there are usually precursors, such as: episodes of chest pain, back pain, toothache, upper limb soreness and upper abdominal pain, ranging from 5 – 10 minutes each time, accompanied by sweating or chest tightness, and a sense of frequent death in heavy cases, which is relieved like a good person without any discomfort. It can recur, 1 time a few days, or multiple times a day. The danger is that there is no discomfort after relief, and many people work and socialize as usual, to the point of sudden aggravation, leading to myocardial infarction, or even sudden death. Suggestion: Once the above symptoms occur, regardless of whether they are heart-related or not, the right thing to do is to go to the hospital immediately to see a cardiologist for a differential diagnosis to avoid a dangerous heart event. If the physician confirms that it is a precursor to acute myocardial infarction, you should respect the medical advice to be hospitalized, rest in bed, and actively treat the disease to control its development and avoid acute myocardial infarction.