Major Depressive Disorder, Adult
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Major depressive disorder (MDD) is a mental health condition. It may also be called clinical depression or unipolar depression. MDD causes symptoms of sadness, hopelessness, and loss of interest in things. These symptoms last most of the day, almost every day, for 2 weeks. MDD can also cause physical symptoms. It can interfere with relationships and activities, such as work, school, and activities that are usually pleasant.
MDD may be mild, moderate, or severe. It may be single-episode MDD, which happens once, or recurrent MDD, which may occur many times.
The exact cause of this condition is not known.
MDD is confirmed if you have either a depressed mood or loss of interest and at least four other MDD symptoms, most of the day, nearly every day, in a 2-week period.
This information is not intended to replace advice given to you by your health care provider. Make sure you discuss any questions you have with your health care provider.
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