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Seasonal affective disorder (SAD) may be a kind of depression that is associated with changes in seasons unhappy begins and ends at regarding constant times each year. If you are like the general public with unhappy, your symptoms begin within the fall and continue into the winter months, sapping your energy and creating you're feeling moody. Less often, unhappy causes depression within the spring or early summer.
SAD becomes depressed in the winter, because of a phase delay in circadiacrhythms relative to the sleep/wake cycle. Seasonal mood symptoms suggest that genetic aberrations may underlie the various abnormalities, which cause SAD symptoms. Melatonin secretion occurs later in the night, Feel sad, grumpy, moody, or anxious, Lose interest in your usual activities, Eat more and crave carbohydrates, such as bread and pasta, Gain weight, Sleep more but still feel tired, Have trouble concentrating.
The prevalence estimates of SAD across 20 retrospective studies varied from 0% to 4.7%. All prospective population studies, except one, find seasonal variations in mood, depressive symptoms usually peaking in winter. SAD was more prevalent at higher northern latitudes, but the prevalence varied across ethnic groups. SAD has also been identified in children and adolescents. Seasonal exacerbations and remissions are not limited to mood disorders; it has also been found in bulimia nervosa, anxiety disorders and other psychiatric illnesses.