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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 with everyday 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 multiple times.
Alcohol and drug use
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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