In heart attack, patients may experience frequent nausea, vomiting, and epigastric distension. When the pain is severe, these symptoms often occur because the necrotic myocardium stimulates the vagus nerve and the myocardial blood output is significantly reduced, resulting in inadequate perfusion and so on, causing the above symptoms. In addition, some people may experience intestinal flatulence, and in severe cases, they may experience eructation and other symptoms. In addition to nausea and vomiting, the earliest symptoms of heart attack are pain, which is severe and persistent. Some patients may develop fever, tachycardia, arrhythmia, often accompanied by weakness, dizziness, syncope, and some may develop hypotension, or even shock, heart failure, etc.