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  2. Biology of depression - Wikipedia

    en.wikipedia.org/wiki/Biology_of_depression

    Several theories concerning the biologically based cause of depression have been suggested over the years, including theories revolving around monoamine neurotransmitters, neuroplasticity, neurogenesis, inflammation and the circadian rhythm. Physical illnesses, including hypothyroidism and mitochondrial disease, can also trigger depressive ...

  3. Catatonic depression - Wikipedia

    en.wikipedia.org/wiki/Catatonic_depression

    The exact cause of catatonic depression is not fully understood. [1] However, it is believed to arise from a complex interplay of genetic, biochemical, and environmental factors. Some research suggests that disturbances in neurotransmitters like dopamine and gamma-aminobutyric acid (GABA) may contribute to the development of catatonic symptoms. [2]

  4. Neurogenesis hypothesis of depression - Wikipedia

    en.wikipedia.org/wiki/Neurogenesis_hypothesis_of...

    While depression is a complex condition with many factors involved, it is commonly attributed to an imbalance of several key monoamine neurotransmitters, including serotonin, dopamine and norepinephrine. This monoamine hypothesis of depression is popular because of the simplicity of the explanation. [4]

  5. Major depressive disorder - Wikipedia

    en.wikipedia.org/wiki/Major_depressive_disorder

    Depression due to physical illness is diagnosed as a mood disorder due to a general medical condition. This condition is determined based on history, laboratory findings, or physical examination . When the depression is caused by a medication, non-medical use of a psychoactive substance, or exposure to a toxin , it is then diagnosed as a ...

  6. Bipolar Disorder: 4 Types & What You Need to Know About Them

    www.aol.com/lifestyle/bipolar-disorder-4-types...

    Some people might have a mix of both symptoms of depression and manic symptoms at the same time. ... There may also be imbalances in mood-regulating neurotransmitters (brain chemicals) like ...

  7. Neurotrophic hypothesis of depression - Wikipedia

    en.wikipedia.org/wiki/Neurotrophic_hypothesis_of...

    The neurotrophic hypothesis of depression [1] proposes that major depressive disorder (MDD) is caused, at least partly, by impaired neurotrophic support.Neurotrophic factors (also known as neurotrophins) are a family of closely related proteins which regulate the survival, development, and function of neurons in both the central and peripheral nervous systems.

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