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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, think …

  2. 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.

  3. 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 can also cause …

  4. 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.

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

    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. Depression - National Institute of Mental Health (NIMH)

    Everyone feels sad or low sometimes, but these feelings usually pass with time. Depression (also called major depressive disorder or clinical depression) is different. It can cause severe symptoms that …

  7. What Is Depression? | Understanding Sadness and Clinical Depression - WebMD

    Jul 19, 2023 · Depression, also known as major depressive disorder, is a mood disorder that makes you feel constant sadness or lack of interest in life. Most people feel sad or depressed at times. It’s a …

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

    Apr 25, 2025 · Depression is a mood disorder that causes persistent feelings of sadness, emptiness, and loss of joy. It differs from the mood fluctuations that people regularly experience in life. Major life...

  9. Depression - MedlinePlus

    Jun 30, 2025 · Depression is more than a feeling of being sad or irritable for a few days. It's a serious mood disorder. As one of the most common mental disorders in the United States, depression can …

  10. What is Depression? | SAMHSA

    Apr 24, 2023 · Major Depressive Disorder, also known as clinical depression, is where people feel that a consistent dark mood is consuming them. It can inhibit daily functions and cause them to lose …