In the field of psychology, cognitive dissonance is the mental discomfort (psychological stress) experienced by a person who simultaneously holds two or more contradictory beliefs, ideas, or values. The occurrence of cognitive dissonance is a consequence of a person performing an action that contradicts personal beliefs, ideals, and values; and also occurs when confronted with new information that contradicts said beliefs, ideals, and values.
In A Theory of Cognitive Dissonance (1957), Leon Festinger proposed that human beings strive for internal psychological consistency in order to mentally function in the real world. A person who experiences internal inconsistency tends to become psychologically uncomfortable, and is motivated to reduce the cognitive dissonance. This is done by making changes to justify their stressful behavior, either by adding new parts to the cognition causing the psychological dissonance, or by actively avoiding social situations and/or contradictory information likely to increase the magnitude of the cognitive dissonance.
Dysphoria (from Greek: (dysphoros), δυσ-, difficult, and φέρειν, to bear) is a profound state of unease or dissatisfaction. In a psychiatric context, dysphoria may accompany depression, anxiety, or agitation. It can also refer to a state of not being comfortable in one's current body, particularly in cases of gender dysphoria. Common reactions to dysphoria include emotional distress; in some cases, even physical distress is seen. The opposite state of mind is known as euphoria