It is a prolonged and persistent periods of extreme sadness. *1.major depressive disorder2.bipolar disordera depression that includes alternating times of extreme sadness. *1.bipolar disorder2.seasonal affective disordermood changes and irritably that occur during the premenstrual phase of a woman's cycle and go away with the onset of menstruation. *1.persistent depressive disorder2.premenstrual dysphoric disordera long term form of depression. *1.persistent depressive disorder2.disruptive mood dysregulation disordera form of depression most often associated with fewer hours of daylight in the far northern and southern latitudes from late fall to early spring. *1.disruptive mood dysregulation disorder2.seasonal affective disorder