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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. 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.

  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. 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. …

  5. Depression (mood) - Wikipedia

    People with depression may experience sadness, feelings of dejection or lack of hope, difficulty in thinking and concentration, hypersomnia or insomnia, overeating or anorexia, or suicidal thoughts. …

  6. 14 common signs and symptoms of depression - Medical News Today

    Jul 11, 2025 · Depression can affect people differently, and the symptoms can vary from person to person. Keep reading to learn more about the common symptoms of depression, as well as the …

  7. 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.

  8. 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.

  9. What Is Depression? - WebMD

    Sep 18, 2024 · Depression, also known as major depressive disorder or clinical depression, is a mood disorder with a group of symptoms including constant sadness or lack of interest in life. Most of us feel...

  10. 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 …