Depression: Introduction

Depression is a common yet misunderstood disorder. It refers to multiple kinds of depression which include bipolar disorder, persistent depressive disorder, seasonal depressive disorder, and psychotic depression. While all of these forms of depression are different, they are all referred to clinical depression or major depressive disorder. Major depressive disorder is a mood disorder that is characterized by a low mood and aversion to activity. Major depressive disorder can affects a person's behaviors, feelings, thoughts, and sense of well-being. In the United States 19 million people suffer from depression and is the most frequent disorder in the world. Worldwide, over one hundred million people suffer from depression.