We say myocardial infarction is a serious heart disease. Common symptoms of myocardial infarction include chest pain. However, some patients with myocardial infarction do not present with chest pain but exhibit other atypical symptoms. For example, some patients present with severe chest tightness and shortness of breath, or acute left heart failure. Others may seek treatment for palpitations or slow heart rate and other arrhythmias. Some exhibit symptoms like toothache or upper abdominal pain, while others may experience dizziness. There are also patients who present with low blood pressure or even go into shock. Therefore, for these patients, it is crucial to perform timely tests like electrocardiograms and troponin levels, and have a specialist make a diagnosis to avoid delays in treatment.