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Depression can be a result of physical, genetic or psychological causes .
Occasional blues or down times are a normal part of our lives. However, extended bouts of depression can be debilitating and destructive. Depression can be a symptom of physical illness such as Parkinson's disease, stroke, arthritis, thyroid problems and cancer. It can also be a side effect of some prescription drugs. And it can be in response to a devastating life change such as the death of a loved one or a divorce.