What is Seasonal Affective Disorder (SAD)? SAD is a type of depression that is associated with the changing of the seasons. Typically, symptoms of SAD are more apparent and severe during the winter months; however, some people may have symptoms during the summer and feel better during the winter.
The exact cause of SAD isn’t fully understood, but it’s often linked to reduced exposure to sunlight during the shorter autumn and winter days.
The main theory is that a lack of sunlight might stop a part of the brain called the hypothalamus working properly, which may affect the production of melatonin, serotonin and the body’s internal clock.
There are a range of treatments available for SAD. These include light therapy, talking therapy and antidepressant medication.
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