241 patients at the age of 22-41 with primary myocardial infarction (MI) and 51 patients who previously had recurrent MI have been examined. Rate of the principal generally accepted risk factors as well as blood group, professional, characterological, nutritional and other peculiarities being able to effect IM incidence were analyzed. The likelihood of primary and recurrent MI was found to be significantly connected with arterial hypertension (AH), hereditary burden, hypercholesteremia, stenocardia, astenoneurotic syndrome. The probability of myocardial infarction, especially of recurrent one, is increased in patients associating AH with stenocardia, hereditary burden with astenoneurotic syndrome, AH with hypercholesteremia, physical and nervous overstrain.