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  1. Depression (major depressive disorder) - Symptoms and causes

  2. 14 common signs and symptoms of depression - Medical News …

  3. Depression: What It Is, Symptoms, Causes, Treatment, and More - Healthline

  4. Depression (major depressive disorder) - Mayo Clinic

  5. What Are the Signs That You Are Severely Depressed? - Verywell …

  6. Depression - National Institute of Mental Health (NIMH)

  7. Depression: Causes, Symptoms, Types & Treatment - Cleveland …

  8. Psychiatry.org - What Is Depression?

  9. Depressive disorder (depression) - World Health Organization …

  10. Depression - National Institute of Mental Health (NIMH)