Myocardial infarction is a relatively common disease in daily life, and it also poses a serious threat to people's health and safety. The symptoms of a myocardial infarction mainly include the following aspects: First, severe chest pain, which is often the most common symptom of myocardial infarction, typically feels like a crushing sensation or is accompanied by a feeling of impending doom. Second, symptoms of heart failure, which, when myocardial infarction is complicated by heart failure, often manifest as difficulty breathing and profuse sweating. Third, symptoms of arrhythmia, which, when myocardial infarction is complicated by arrhythmia, often presents with symptoms like palpitations and dizziness.