Mood Disorders

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  • A class of psychological disorders on Axis I of Diagnostic and Statistical Manual of Mental Disorders (fourth edition; DSM-IV), involving disturbances in mood states, such as mania or depression. Mood disorders may be divided into two general types: (1) depressive disorders and (2) bipolar disorders.

    • Depressive disorders are often called unipolar disorders, as they involve only the depressive pole of a spectrum of moods. The most common depressive disorder is major depressive disorder, which is characterized by feelings of worthlessness, changes in sleep or appetite, lethargy, and loss of interest in pleasurable activities. Seasonal affective disorder (SAD) is a type of depressive disorder characterized by a repeated pattern of severe depression in the fall and winter, followed by elevated mood during spring and summer. Dysthymic ...

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