Patients with acute myocardial infarction may have precursors such as aggravation of angina pectoris, epigastric pain, gastrointestinal symptoms, etc. before the onset of the disease, as follows. 1. Angina aggravation: the patient feels that the degree of angina is aggravated, the attacks are more frequent, the pain lasts longer, the angina relief is not obvious or the effect of medicine is not good, etc. Even patients who have not had angina attacks in the past suddenly have prolonged angina. Even patients who have not had angina in the past suddenly experience prolonged angina. There may also be accompanied by irritability, chest tightness, sweating, near-death feeling and other symptoms. 2. Epigastric pain: some patients may have epigastric pain before the onset of acute infarction, which may be mistaken for acute gastrointestinal perforation, acute pancreatitis and other acute abdominal diseases. 3. Gastrointestinal symptoms: Some patients may experience gastrointestinal symptoms such as nausea, vomiting and abdominal distension. Some patients may have other symptoms such as generalized discomfort, fever, bone and joint pain. Acute myocardial infarction attack precursors are more, and most of them are not specific, it is recommended that patients who have the above symptoms that may be suspected of acute myocardial infarction, consult a doctor for a clear diagnosis in a timely manner, in order to avoid adverse effects.