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  2. 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 ]

  3. Endogenous depression - Wikipedia

    en.wikipedia.org/wiki/Endogenous_depression

    Endogenous depression is an atypical subclass of major depressive disorder (clinical depression). It could be caused by genetic and biological factors. [ 1 ] Endogenous depression occurs due to the presence of an internal (cognitive, biological) stressor instead of an external (social, environmental) stressor. [ 2 ]

  4. Major depressive episode - Wikipedia

    en.wikipedia.org/wiki/Major_depressive_episode

    [12] [13] [14] One interpretation is that depression manifests due to an imbalance of neurotransmitters in the brain, resulting in feelings of worthlessness and despair. Magnetic resonance imaging shows that the brains of people diagnosed with depression may have a hippocampus up to 10% smaller than those who do not exhibit signs of depression.

  5. 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 The reason given is: Many outdated sources and information (older than five years).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 ...

  6. 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 ...

  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]