Background: Myocardial infraction (MI) is defined as the necrosis in the myocardium due to the lack of the oxygen supply of heart which cannot be supplied by the coronary artery. The most prominent risk factors for myocardial infarction are older age, actively smoking, high blood pressure, diabetes mellitus, and total cholesterol and high-density lipoprotein levels. Aim of the Study: assess risk factors of myocardial infarction among adults. Design: A descriptive analytical design was used. Subjects and Methods: Setting: The study was conducted in cardiovascular hospital / Ain Shams University Hospitals. Size: the sample composed of 350 myocardial patients according to inclusion criteria. Tools: Tool 1: A Structured Interviewing Questionnaire Sheet that contain four parts; Part I Socio - demographic data of studied patients, past and present medical history of the studied patients, Part III: patient's knowledge about myocardial infarction and Part II: patient's reported practices regarding myocardial infarction and Tool 2: Risk factors assessment sheet. Results: Near to one third of the studied sample had satisfactory knowledge about myocardial infarction and around three quarter of the studied sample have inadequate level of total reported practices regarding myocardial infarction. Around two third of the studied sample have unmodifiable risk factors for myocardial infarction as sex and family history and about one quarter of them reported early menopause as a risk factors for myocardial infarction respectively. Conclusion: There was highly significant positive correlation between participants` knowledge and their practices regarding myocardial infarction. Also, there is statistically significant relation between sample' reported practices regarding myocardial infarction and all MI risk factors. Recommendation: Conducting health education program for patients with myocardial infarction to improve their knowledge and practice regarding their disease through establishment of a web site.