Excerpt of Article on Yahoo Health
Depression is diagnosed when a person experiences five or more specific symptoms for more than two weeks, according to the American Psychiatric Association. Those symptoms include feelings of sadness and loss of pleasure in activities you once enjoyed, changes in appetite that cause weight loss or gain, sleeping too little or too much, feeling tired all the time, having difficulty concentrating and making decisions, and feeling angry and irritable. People with depression might also have feelings of worthlessness or guilt, unexplained physical pain like headaches or backaches, and frequent thoughts of death or suicide.
Thanks to Yahoo Health for writing, publishing, and distributing the article in this post; Wyatt Myers for writing the supporting article which was medically reviewed by Lindsey Marcellin, MD, MPH; Google for helping me find the Yahoo Health article; and all the other people who, directly or indirectly, made it possible for me to include the picture and text in this post.