This review describes pertinent demographic and ill ness characteristics of patients who are seen with atyp ical symptoms of acute myocardial infarction. The determination of psychosocial, behavioral, and envi ronmental patterns of patients complaining of chest discomfort adds important information to the clinical assessment of chest pain. Systematic information about the pain and other symptoms of acute myocardial infarc tion and about the variables that influence these symp toms can assist practitioners as well as sufferers of myo cardial pain to resolve the uncertainty surrounding it.