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

• Lack of interest in pleasurable activities

• Weight loss when not dieting or weight gain

• Difficulty sleeping, excessive sleeping, or insomnia

• Low energy or fatigue

• Feelings of worthlessness

• Difficulty concentrating

• Low self-esteem