Depression is characterized by an acute or chronic low mood. Depression can range from an acute episode of a severe low mood to a chronic low mood on most days. Regardless of the severity or duration of the low mood, common symptoms of depression include the following:
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Depressed mood
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Lack of interest in pleasurable activities
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Weight loss when not dieting or weight gain
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Difficulty sleeping, excessive sleeping, or insomnia
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Low energy or fatigue
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Feelings of worthlessness
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Difficulty concentrating
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Low self-esteem
