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Symptoms of this disorder include: persistent sad, anxious, or "empty" feelings, feelings of hopelessness or pessimism, feelings of guilt, worthlessness, or helplessness, loss of interest in activities or hobbies once pleasurable, thoughts of suicide. Symptoms must have lasted for over 2 weeks, are a change from one's normal state, and interfere with one's day-to-day functioning.
What is Major Depressive Disorder?