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Depression is a mental state of low mood and aversion to activity. [3] It affects more than 280 million people of all ages (about 3.5% of the global population). [4] Depression affects a person's thoughts, behavior, feelings, and sense of well-being. [5] Depressed people often experience loss of motivation or interest in, or reduced pleasure or ...
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 ...
A mood disorder, also known as an affective disorder, is any of a group of conditions of mental and behavioral disorder [2] where a disturbance in the person's mood is the main underlying feature. [3] The classification is in the Diagnostic and Statistical Manual of Mental Disorders (DSM) and International Classification of Diseases (ICD).
Dysthymia often co-occurs with other mental disorders. A "double depression" is the occurrence of episodes of major depression in addition to dysthymia. Switching between periods of dysthymic moods and periods of hypomanic moods is indicative of cyclothymia, which is a mild variant of bipolar disorder.
A mental disorder, also referred to as a mental illness, [6] a mental health condition, [7] or a psychiatric disability, [2] is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. [8] A mental disorder is also characterized by a clinically significant disturbance in an individual's cognition ...
Medication. Antidepressants. 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 ...
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]
In the DSM-5, it is called unspecified depressive disorder. Examples of disorders in this category include those sometimes described as minor depressive disorder and recurrent brief depression. "Depression" refers to a spectrum of disturbances in mood that vary from mild to severe and from short periods to constant illness.
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