What is Depression? (1)Major depressive disorder: Combination of symptoms interfering with person’s ability to work, sleep, study, eat, & enjoy once-pleasurable activities. Disabling & prevents person from functioning normally. Often recurs in persons life. (2)Dysthymic disorder: Long-term (> 2 years) but less severe symptoms that may not disable a person but can prevent one from functioning normally or feeling well. (3)Psychotic depression: Severe depressive illness accompanied by some form of psychosis, such as break with reality, hallucinations, & delusions. (4)Postpartum depression: When new mother develops major depressive episode within one month after delivery. Estimated that 10-15% women with postpartum depression after giving birth. (5)Seasonal affective disorder (SAD): Depression during winter months, when less natural sunlight, that lifts during spring and summer. Half of these cases do not respond to light therapy alone but responsive to combo antidepressants, light, and psychotherapy. (6)Bipolar disorder: Aka manic-depression. Cycling mood changes from extreme highs (mania) to extreme lows (depression).