It's normal to feel down once in a while, but if you're sad most of the time and it affects your daily life, you may have depression. There are many different types of depression. Events in your life cause some, and chemical changes in your brain cause others. Seasonal Affective Disorder, or S.A.D., which is a period of major depression that most often happens during these winter months, when the days grow short and we get less and less sunlight.

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