For 10 points, name this mood disorder whose sufferers lose pleasure in formerly enjoyable activities and generally experience sadness.
Dysthymia is a long-term, mild form of this state. People diagnosed with seasonal affective disorder develop symptoms of this state in the winter. Sufferers of bipolar disorder (*) alternate being in this state and mania. This disorder is commonly treated with selective serotonin reuptake inhibitors such as Celexa, Zoloft, and Prozac. For 10 points, name this mood disorder whose sufferers lose pleasure in formerly enjoyable activities and generally experience sadness.
Dysthymia is a long-term, mild form of this state. People diagnosed with seasonal affective disorder develop symptoms of this state in the winter.
clinical {depression} [or {major depressive} disorder]