Common symptoms of myocardial infarction include chest pain, palpitation, dyspnea, dizziness, fever and shock. 1. Chest pain: it mostly occurs under the triggers of physical activity and emotional excitement, and its location is often at the back of the sternum or precordial area. The pain lasts more than 20 minutes and is not relieved after rest. Sometimes it is accompanied by pain in the left arm, neck and upper abdomen, and there is pallor during the attack. 2. Palpitations: patients feel that their heart beats faster, often accompanied by panic. 3. Dyspnea: the patient feels tight and breathless. 4. Dizziness: it is often manifested as dizziness, and in severe cases, fainting and loss of consciousness. Elderly patients may experience confusion, etc. 5. Fever: Fever may develop one or two days after pain, the degree is related to the extent of infarction, and the fever may last for a week. 6. Shock: Some patients may experience loss of consciousness, dyspnea, and black eyes. If any of the above symptoms occur, it is recommended to seek prompt medical treatment to minimize the adverse effects of the disease.