Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Depression is one of the leading causes of disability worldwide, affecting 121 million people. Everyone can be affected by the disorder, regardless of age, sex and socioeconomic background, however, less than 25% of individuals suffering from major depressive disorder receive adequate treatment. The most common forms of management of depression are psychotherapy, psychiatric medications as well as electroconvulsive therapy. Learn more about the disorder and its treatment in this book.