Depression
Depression is extreme sadness or despair that is present most days and lasts longer than two weeks. It interferes with the activities of daily life and can cause physical symptoms such as pain, weight loss or gain, sleeping pattern disruptions, or lack of energy. People with depression may also experience an inability to concentrate, feelings of worthlessness or excessive guilt, and recurrent thoughts of death or suicide.
Depression is the most common mental disorder. A combination of therapy and antidepressant medication can help ensure recovery.