Wikipedia on Anhedonia:
In psychology and psychiatry, anhedonia (< Greek ἀν- an-, “without” + ἡδονή hēdonē, “pleasure”) is defined as the inability to experience pleasure from activities formerly found enjoyable, e.g. hobbies, exercise, social interaction or sexual activity.
Anhedonia can be a characteristic of mental disorders including mood disorders, schizoaffective disorder, schizoid personality disorder and schizophrenia. Affected schizophrenic patients describe themselves as feeling emotionally empty.[1]
Mood disturbances are commonly observed in many psychiatric disorders. Disturbing mood changes may occur resultant to stressful life events and they are not uncommon during times of physical illness. [2] While anhedonia can be a feature of such mood changes, they are not mutually inclusive.
