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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]
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 adopted by the American ...
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 regular mood changes and feelings about everyday life. It can affect all aspects of life.
Economic depression. An economic depression is a period of carried long-term economic downturn that is the result of lowered economic activity in one or more major national economies. It is often understood in economics that economic crisis and the following recession that may be named economic depression are part of economic cycles where the ...
Base rates and prevalence. About 8% of children and adolescents suffer from depression. [7] In 2016, 51% of students (teens) who visited a counseling center reported having anxiety, followed by depression (41%), relationship concerns (34%) and suicidal ideation (20.5%). [8] Many students reported experiencing multiple conditions at once.
Biology of depression. Scientific studies have found that different brain areas show altered activity in humans with major depressive disorder (MDD), [1] and this has encouraged advocates of various theories that seek to identify a biochemical origin of the disease, as opposed to theories that emphasize psychological or situational causes.
In the mid-20th century, researchers theorized that depression was caused by a chemical imbalance in neurotransmitters in the brain, a theory based on observations made in the 1950s of the effects of reserpine and isoniazid in altering monoamine neurotransmitter levels and affecting depressive symptoms. [32]
A major depressive episode (MDE) is a period characterized by symptoms of major depressive disorder. Those affected primarily exhibit a depressive mood for at least two weeks or more, and a loss of interest or pleasure in everyday activities. Other symptoms can include feelings of emptiness, hopelessness, anxiety, worthlessness, guilt ...
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