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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 ]
Depression is commonly attributed to a deficiency in monoamines, such as serotonin. The monoamine hypothesis of depression suggests that depression is primarily caused by a deficiency of several monoamines, namely serotonin, dopamine and norepinephrine. [2] This hypothesis is widely accepted due to its simplicity. [3]
NHS figures show that the number of people in England taking antidepressants continues to rise, with 8.3m patients receiving them in 2021/22.
Physical activity has been shown to boost mood, decrease symptoms of depression, and reduce stress. If it gets darker outside earlier in the winter, try to take short walks throughout the day to ...
There may also be imbalances in mood-regulating neurotransmitters (brain chemicals) like dopamine and serotonin. But this isn’t well understood, either. But this isn’t well understood, either.
Since serotonin deficiency has been recognized as a possible cause of depression, it has been suggested that consumption of tryptophan or 5-HTP may therefore improve depression symptoms by increasing the level of serotonin in the brain. [135] 5-HTP and tryptophan are sold over the counter in North America, but requires a prescription in Europe.
Serotonin in the brain is not usually degraded after use, but is collected by serotonergic neurons by serotonin transporters on their cell surfaces. Studies have revealed nearly 10% of total variance in anxiety-related personality depends on variations in the description of where, when and how many serotonin transporters the neurons should deploy.
Depression can have multiple, sometimes overlapping, origins. Depression can be a symptom of some mood disorders, some of which are also commonly called depression, such as major depressive disorder, bipolar disorder and dysthymia. [7] Additionally, depression can be a normal temporary reaction to life events, such as the loss of a loved one.
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