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A depressive disorder involves the body, mood and thoughts. It affects the way a person eats and sleeps, the way one feels about oneself and the way one thinks about things. A depressive disorder is not the same as a passing blue mood. It is not a sign of personal weakness or a condition that can be willed or wished away. People with a depressive illness cannot merely “pull themselves together” and get better. Without treatment, symptoms can last for weeks, months or years. Appropriate treatment, however, can help most people who suffer from depression.