This PhD dissertation aims to document whether personality traits and economic preferences are stable parameters after the occurrence of a significant health event. Given the massive impacts of traits and preferences on life outcomes, it is necessary to provide information as to how much these can change. Results show that traits are slightly modified when individuals face a health event (Chapter 1). Economic preferences, however, do not change after the occurrence of such events (Chapter 2). The finding that preferences are stable might call for a genetic transmission of these parameters. However, results show that economic preferences are not determined in-utero (Chapter 3). Additionally, individuals facing health events are more likely t...