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Seasonal affective disorder (SAD) is a mood disorder that is characterized by symptoms that occur at the same time each year, usually during the darker, shorter days of fall and winter.
Currently called major depressive disorder with seasonal pattern.
SAD is believed to be triggered by a disturbance in the normal circadian rhythm of the body.
Light entering through the eyes influences this rhythm, and any seasonal variation in night/day pattern can cause a disruption leading to depression.
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Atypical depression is a type of depression that does not follow what was thought to be the "typical" presentation of the disorder.
Premenstrual dysphoric disorder (PMDD) produces similar symptoms, but those related to mood are more pronounced.
Bipolar disorder is a mood disorder characterized by periods of abnormally elevated mood known as mania.
Postpartum depression (PPD) is clinical depression that occurs following childbirth.
From a medical standpoint, depression is defined as a mood disorder that causes a persistent feeling of depressed mood or sadness and the often profound loss of interest in things that usually bring you pleasure.
People might experience brief periods of not feeling depressed, but this relief of symptoms lasts for two months or less.
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