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  2. A study identified 6 types of depression. Here’s why ... - AOL

    www.aol.com/6-types-depression-found-brain...

    About 280 million people worldwide and 26 million people in the United States have depression, which is a leading cause of disability. Some 30% to 40% of people with depression do not experience ...

  3. Biology of depression - Wikipedia

    en.wikipedia.org/wiki/Biology_of_depression

    The biology of depression is the attempt to identify a biochemical origin of depression, as opposed to theories that emphasize psychological or situational causes. Scientific studies have found that different brain areas show altered activity in humans with major depressive disorder (MDD) . [ 1 ]

  4. Why Do I Feel Sad for No Reason? Potential Causes and ... - AOL

    www.aol.com/lifestyle/why-feel-sad-no-reason...

    Feeling sad for no reason may happen due to depression, stress, sleep deprivation, grief, and other reasons. Learn all the potential causes, as well as tips for coping. ... Learn all the potential ...

  5. What causes seasonal depression? Here's what to know ... - AOL

    www.aol.com/causes-seasonal-depression-heres...

    The brain chemical serotonin produces feelings of happiness. Sunlight can regulate serotonin, but because we run out of sunlight quite early in the day during late fall and winter, our brains will ...

  6. Major depressive disorder - Wikipedia

    en.wikipedia.org/wiki/Major_depressive_disorder

    This article needs to be updated. The reason given is: Many outdated sources and information (older than five years). Please help update this article to reflect recent events or newly available information. (July 2024) Medical condition Major depressive disorder Other names Clinical depression, major depression, unipolar depression, unipolar disorder, recurrent depression Sorrowing Old Man (At ...

  7. Mood disorder - Wikipedia

    en.wikipedia.org/wiki/Mood_disorder

    Causes: Family history, previous diagnosis of a mood disorder, trauma, stress or major life changes in the case of depression, physical illness or use of certain medications. Depression has been linked to major diseases such as cancer, diabetes, Parkinson's disease and heart disease, Brain structure and function in the case of bipolar disorder. [1]