Problem: We often hear people say "I am SO depressed today!", referring to a bad day or some bad news. However, because this is such a common phrase used day to day most people do not realize how different an actual Depressive Disorder is from simply feeling sad. What distinguishes a diagnosable depressive disorder from someone who is feeling sad or "down"? What are some of the psychological and biological factors that play a role in the development of a depressive disorder?