Major depressive disorder is a mood disorder that affects more than 15 million adults in the United States.
Individuals with depression may not even report depressive signs and symptoms and instead present to their physician for somatic or physical symptoms such as headaches, abdominal pain, muscle pain, and fatigue.
Individuals may also complain of irritability or problems concentrating. Adolescents with major depressive disorder may present with a decline in school performance, substance abuse, irritability or social withdrawal and elderly individuals often present with confusion or a decline in general functioning.
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