Regret is a negative conscious and emotional reaction to personal past acts and behaviors. Regret is often expressed by the term "sorry." Regret is often a feeling of sadness, shame, embarrassment, depression, annoyance, or guilt, after one acts in a manner and later wishes not to have done so. Regret is distinct from guilt, which is a deeply emotional form of regret — one which may be difficult to comprehend in an objective or conceptual way. In this regard, the concept of regret is subordinate to guilt in terms of its emotional intensity. By comparison, shame typically refers to the social (rather than personal) aspect of guilt or (in minor context) regret as imposed by the society or culture (enforcement of ethics, morality), which has substantial bearing in matters of (personal and social) honor.
It is also distinct from remorse, which is a more direct and emotional form of regret over a past action that is considered by society to be hurtful, shameful, or violent. Unlike regret, it includes a strong element of desire for apology to others rather than an internal reflection on one's actions, and may be expressed (sincerely or not) in order to reduce the punishment one receives.
Regret can describe not only the dislike for an action that has been committed, but also, importantly, regret of inaction. Many people find themselves wishing that they had done something in a past situation.
Furthermore, guilt can lead a person to mental illness, such as with survivor guilt.
Existential regret has been specifically defined as 'a profound desire to go back and change a past experience in which one has failed to choose consciously or has made a choice that did not follow one’s beliefs, values, or growth needs'.
See also 
- Lucas, Marijo (January 2004). "Existential Regret: A Crossroads of Existential Anxiety and Existential Guilt". Journal of Humanistic Psychology 44 (1): 58–70. doi:10.1177/0022167803259752. Retrieved 15 March 2011.
- Coricelli G, Critchley HD, Joffily M, O'Doherty JP, Sirigu A, Dolan RJ. (2007). Regret and its avoidance: a neuroimaging study of choice behavior. Nat Neurosci. 8(9):1255-62. PMID 16116457
- Coricelli G, Dolan RJ, Sirigu A. (2007). Brain, emotion and decision making: the paradigmatic example of regret. Trends Cogn Sci. 11(6):258-65. PMID 17475537
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