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  2. Major depressive disorder - Wikipedia

    en.wikipedia.org/wiki/Major_depressive_disorder

    163 million (2017) [ 8 ] Major depressive disorder (MDD), also known as clinical depression, is a mental disorder [ 9 ] characterized by at least two weeks of pervasive low mood, low self-esteem, and loss of interest or pleasure in normally enjoyable activities. Introduced by a group of US clinicians in the mid-1970s, [ 10 ] the term was ...

  3. Prevalence of mental disorders - Wikipedia

    en.wikipedia.org/wiki/Prevalence_of_mental_disorders

    A review that pooled surveys of mood disorders in different countries up to 2000 found 12-month prevalence rates of 4.1% for major depressive disorder (MDD), 2% for dysthymic disorder and 0.72% for bipolar 1 disorder. The average lifetime prevalence found was 6.7% for MDD (with a relatively low lifetime prevalence rate in higher-quality studies ...

  4. Depression (mood) - Wikipedia

    en.wikipedia.org/wiki/Depression_(mood)

    Emotions. v. t. e. Depression is a mental state of low mood and aversion to activity. [3] It affects about 3.5% of the global population, or about 280 million people of all ages (as of 2020). [4] Depression affects a person's thoughts, behavior, feelings, and sense of well-being. [5]

  5. Epidemiology of depression - Wikipedia

    en.wikipedia.org/wiki/Epidemiology_of_depression

    People are most likely to suffer their first depressive episode between the ages of 30 and 40, and there is a second, smaller peak of incidence between ages 50 and 60. [8] The risk of major depression is increased with neurological conditions such as stroke, Parkinson's disease, or multiple sclerosis and during the first year after childbirth. [9]

  6. Seasonal affective disorder - Wikipedia

    en.wikipedia.org/wiki/Seasonal_affective_disorder

    Specialty. Psychiatry. Seasonal affective disorder (SAD) is a mood disorder subset in which people who typically have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year. [1][2] It is commonly, but not always, associated with the reductions or increases in total daily sunlight hours that occur ...

  7. History of depression - Wikipedia

    en.wikipedia.org/wiki/History_of_depression

    What was previously known as melancholia and is now known as clinical depression, major depression, or simply depression and commonly referred to as major depressive disorder by many health care professionals, has a long history, with similar conditions being described at least as far back as classical times.