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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. 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.

  4. Causes of mental disorders - Wikipedia

    en.wikipedia.org/wiki/Causes_of_mental_disorders

    Any damage to the brain can cause a mental disorder. The brain is the control system for the nervous system and the rest of the body. Without it, the body cannot function properly. [71] Increased mood swings, insane behavior, and substance abuse disorders are traumatic brain injury (TBI) examples. Findings on the relationship between TBI ...

  5. 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.

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 The reason given is: Many outdated sources and information (older than five years).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