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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 ...
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]
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.
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 ...
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]
For years, a chemical imbalance of serotonin has been widely viewed as the culprit for depression, resulting in the widespread use of antidepressants. The study published this week in the journal…
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