Biological differences such as the physical alteration of the brain responsible for mood, thinking, appetite, sleep, and behavior have been found in people with depression (Depression (major depressive disorder)). Also, differences in brain chemistry such as a chemical imbalance of a specific neurotransmitter like serotonin, norepinephrine, and dopamine have been found in people suffering from depression (Hasler, G. , 2010). ... For instance, people who have experienced neglect, physical or sexual abuse, death of a love one, financial instability, high stress, or have no social support are mor...

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