Affective disorders (also known as mood disorders) are mental conditions (such as anxiety or depression) characterised by dramatic changes or extremes of mood.
According to the Encyclopaedia Britannica 'Affective disorders may include manic (elevated, expansive, or irritable mood with hyperactivity, pressured speech, and inflated self-esteem) or depressive (dejected mood with disinterest in life, sleep disturbance, agitation, and feelings of worthlessness or guilt) episodes, and often combinations of the two. Persons with an affective disorder may or may not have psychotic symptoms such as delusions, hallucinations, or other loss of contact with reality.'
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