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Normal Depressed mood
This is what most people feel time to time. It is a natural reaction to life stressors such as changes in work, relationships, etc. Person recovers after a short period of time.
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Major Depression
Begins similar to a normal depressed mood, but major depression is when it begins to interfere with normal functioning and can continue for months or even years.
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Dysthymia
This is a chronic state of mild depression that causes people to feel down most of the time.
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Bipolar or manic depressive disorder
This involves alternating episodes of major depression and mania (elevated mood).
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Seasonal Affective Disorder
This results from changes in the seasons. Usually begins in late fall/winter and clears up early spring.
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Atypical Depression
This is an unusual depressed state that lasts for a few days and then clears up.
Any one of these types of depression can require professional help. If you think your or a loved one might be experiencing depression, it is important to contact your medical professional.




As a physician, I would say that this post discovers all the key points of such a popular disease as depression.