Low self‐esteem appears to be both a vulnerability factor for cardiac diseases and a result of cardiac diseases. Thus enhancing self‐esteem might facilitate recovery and/or help to prevent recurrence. Since some evidence suggests that self‐esteem might even serve as an important gauge of cardiac rehabilitation, it is therefore important to know more of the construct of self‐esteem to enable the planning of a more promising rehabilitation process. This paper explores the source and basis of the self‐esteem of Hong Kong Chinese with cardiac diseases. One hundred and fifty‐two adults with cardiac diseases and 146 adults not suffering from any major illness participated in this study. The Adult Source of Self‐Esteem Inventory (ASSEI) (Elovson & Fleming, 1989), open‐ended questions on self‐evaluation, and interviewing were the major procedures used to identify the sources and basis of the self‐esteem of persons with and without cardiac diseases. The subjects' important life aspects were identified through interpreting their responses to open‐ended questions and interviews. Moreover, a structured questionnaire on their subjective perceptions of importance and satisfaction in different life areas was used to identify the relationships between discrete self‐concept variables. Factor analysis of their responses to the 20 ASSEI items revealed four factors, namely, Interpersonal Relationship, Personal Quality, Physical Self, and Personal Achievement. We also examined and compared the means and ranks of the ASSEI items as indicated by the subjects. Content analysis of open‐ended questions further confirmed the self‐esteem domains of persons with cardiac diseases. The discrepancy of ideal‐actual physical abilities was found to be more prominent in the cardiac group. It was also found that family is an important entity to Chinese individuals with cardiac diseases. Implications of the findings to rehabilitation of persons with cardiac diseases were also discussed.