depression. Depression is a mood disorder characterized by loss of interest, sadness, hopelessness, loss of appetite, disturbed sleep, and other physical symptoms. Depression takes different forms but usually involves discouragement and can also include a feeling of sadness and hopelessness, trouble concentrating or making decisions, and a loss of pleasure in doing usual activities. One type of depression is seasonal affective disorder (SAD). This type of disorder is a mood disorder that is characterized…
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