For most people, depression is caused by multiple factors, but for some people it is just one factor that can cause the illness(Colman, Ian, and Ataullahjan 622-632). There are several cases of depression where people seem to be depressed for no reason at all. There are a lot of things that can cause depression. Depression can be caused by biological factors such as the brain over producing or not producing enough chemicals called neurotransmitters. Neurotransmitters are chemicals that are released from a nerve cell that transmits impulses and reactions to life events properly to other parts of the body. People who have more of a pessimistic outlook on life tend to have a higher risk of depression. Cau...
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Uher, R., and P. McGuffin. "The moderation by the serotonin transporter gene of environmental adversity in the aetiology of mental illness: review and methodological analysis." Molecular Psychiatry 13.2 (2008): 131-146. Psychology and Behavioral Sciences Collection. EBSCO. Web. 22 Mar. 2011.
Uher, R., and P. McGuffin. "The moderation by the serotonin transporter gene of environmental adversity in the etiology of depression: 2009 update." Molecular Psychiatry 15.1 (2010): 18-22. Psychology and Behavioral Sciences Collection. EBSCO. Web. 22 Mar. 2011.
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