The document discusses mood disorders including major depression, dysthymia, and bipolar disorder types 1 and 2. It covers etiology such as genetic and psychosocial factors. Symptoms of major depression include depressed mood and loss of interest while mania involves increased energy, activity, and self-esteem. Nursing assessments include medical history and mental status exam. Nursing interventions aim to prevent suicide, maintain nutrition and sleep, and support treatment like medication, psychotherapy, and electroconvulsive therapy.