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In psychology, anhedonia (< an- + Greek h?don? pleasure ?????) is an
inability to experience pleasure from normally pleasurable life events such
as eating, exercise, and social or sexual interaction.
Anhedonia is recognized as one of the key symptoms of the mood disorder
depression according to both the Diagnostic and Statistical Manual of
Mental Disorders (DSM) and the International Statistical Classification of
Diseases and Related Health Problems (ICD). Other than anhedonia, the DSM
considers only depressed mood to be a key symptom. The ICD lists both
depressed mood and fatigue or loss of energy as the other key symptoms.
Anhedonia is also seen in schizophrenic disorders and other mental
disorders.
Causes Researchers theorize that anhedonia may result from the breakdown
in the brain's reward system, involving dopamine pathways. Two 2005 studies
by Paul Keedwell MD of King's College fo
