Post traumatic stress disorder (PTSD) is a mental health condition that triggered by a terrifying events. Myocardial infarction is commonly known as heart attack that happens when blood stops flowing properly to heart & heart muscles. The objective of the study was to assess the level of post traumatic stress experienced by myocardial infarction patients and to associate the level of post traumatic stress of myocardial infarction patient with the selected demographic variables. The study was done by non experimental descriptive research design. The sample size was 50 patients with myocardial infarction and the stress level was assessed using the rating scale developed by Twen Christeanson et.al. At the time of initial assessment out of 50 clients, 35 were in mild post traumatic stress, 13 were in moderate post traumatic stress and 2 were in severe post traumatic stress. The mean score was 53.00 and standard deviation was 19.52. There is a significant association of the level post traumatic stress experience with selected demographic variables among clients with myocardial infarction.