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

    Oct 14, 2022 · 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, …

  2. Depression: Causes, Symptoms, Types & Treatment

    Jan 13, 2023 · 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 …

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

    Oct 27, 2023 · Depression is classified as a mood disorder. It may be described as feelings of sadness, loss, or anger that interfere with a person’s everyday activities. It’s also fairly common.

  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. Depressive disorder (depression) - World Health Organization …

    Aug 29, 2025 · 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. …

  6. 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.

  7. Major depressive disorder - Wikipedia

    Major depressive disorder (MDD), also known as clinical depression, is a mental disorder [10] characterized by at least two weeks of pervasive low mood, low self-esteem, and loss of …

  8. Major Depressive Disorder | National Alliance on Mental Illness

    MDD is sometimes also referred to as clinical depression. Fortunately, with early identification, diagnosis and a treatment plan that can include a combination of medication, psychotherapy …

  9. Depression – Depressive Disorder - Main Line Health

    Depression, also referred to as depressive disorder, is a common and serious mood disorder. It manifests as persistent feelings of sadness and a loss of interest and pleasure in activities. …

  10. Depression - Harvard Health

    May 17, 2022 · 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 irritability.