We experienced the left lower lobe pneumonia simulating myocardial infarction in the eletrocardiogram. Eletrocardiographic changes were return to normal after the pneumonic infiltration had subsided. The finding in our case simply reconfirm the well-established principle that the surface electrocardiogram mirros the electrical phenomena of the heart, and it is important to draw attention to noncoronary syndrome that mimic ischemic heart disease.