An atypical myocardial infarction may present as a dull pain in the mid-upper abdomen, which may be accompanied by nausea and vomiting. Such patients are often misdiagnosed as having dyspepsia or chronic gastritis, and the presence of significant myocardial ischemia is only detected when an electrocardiogram is performed. Atypical myocardial infarction may also manifest as swollen gums and neck pain, and some patients will visit the dentist for this reason, and the presence of myocardial ischemia is only considered during a routine ECG. Patients with atypical heart and infarction may also present with weakness and dizziness atypical of the heart. Therefore, for elderly people, patients with underlying diseases such as hypertension, coronary artery disease and diabetes, it is advisable to have an electrocardiogram to rule out the possibility of acute myocardial infarction if they experience discomfort.