However , it is still unclear if the chemical imbalance causes depression or if depression trigger the imbalance (Smith Jaffe , 2007 . Some neurochemicals are also involved , such as noradrenaline , serotonin , and the stress hormone , cortisol . The prescribed medications for depression target these particular body chemicals and impede their actions that trigger depression . These physiological problems , together with inherent beliefs and behaviors , render difficulty in making decisions . They only reinforce the vicious cycle of depression working inside the human system (Murray Fortinberry...











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