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

    Mar 14, 2026 · Depression is a mood disorder that causes a persistent feeling of sadness and loss of interest. Also called major depressive disorder or clinical depression, it affects how you feel, think …

  2. Depression: Causes, Symptoms, Types & Treatment

    Overview What is depression? Depression is a mood disorder that causes a persistent feeling of sadness and loss of interest in things and activities you once enjoyed. It can also cause difficulty with …

  3. Depressive disorder (depression) - World Health Organization (WHO)

    Depressive disorder (also known as depression) is a common mental disorder. It involves a depressed mood or loss of pleasure or interest in activities for long periods of time. Depression is different from …

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

    Learn about NIMH research on depression. Find resources on the signs and symptoms of depression, types, and potential treatments and therapies.

  5. What Is Depression? - Psychiatry.org

    Depression (major depressive disorder) is a common and serious medical illness that negatively affects how you feel, the way you think and how you act. Fortunately, it is also treatable.

  6. Depression: Causes, symptoms, treatment, and more

    Apr 25, 2025 · Depression is a common mental health condition that involves low mood and other symptoms. Learn about the types, causes, treatment options, and more.

  7. What is Depression? - SAMHSA

    Apr 24, 2023 · Depression is a disorder of the brain. It is a serious mental illness that is more than just a feeling of being "down in the dumps" or "blue" for a few days.

  8. Depression Overview - Harvard Health

    Mar 8, 2026 · What is depression? Depression is more than just a passing blue mood, a bad day, or temporary sadness. The most common symptom is a low mood that can sometimes appear as …

  9. Major Depression - Johns Hopkins Medicine

    Depression is a serious mood disorder. It touches every part of your life and is caused by a chemical imbalance in your brain. Treatment involves medicine and counseling.

  10. Depression Center: Symptoms, Causes, Medications, and Therapies

    An estimated 19 million American adults are living with major depression. Here you'll find in-depth depression information including symptoms, medications, and therapy.