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What is the prevalence of Seasonal Affective Disorder?

How many people does Seasonal Affective Disorder affect? Does it have the same prevalence in men and women? And in the different countries?

Prevalence of Seasonal Affective Disorder

The prevalence of Seasonal Affective Disorder (SAD) varies depending on geographical location and population. However, it is estimated that SAD affects about 1-10% of the population in countries with higher latitudes, where winters are longer and darker. The disorder is more common in women than men, with symptoms typically appearing during late fall or early winter and subsiding in spring. SAD can significantly impact an individual's mood, energy levels, and overall well-being. It is important to seek professional help if experiencing symptoms of SAD.



Seasonal Affective Disorder (SAD) is a type of depression that typically occurs during the fall and winter months when daylight hours are shorter. It is estimated that approximately 5% of the population in the United States experiences SAD, with higher rates observed in northern latitudes where winters are longer and darker. SAD is more common in women than men, with women comprising about 60-80% of diagnosed cases.


The prevalence of SAD varies across different countries and populations. For example, in countries like Finland and Iceland where winters are particularly harsh, the prevalence of SAD can be as high as 10-20%. On the other hand, in countries closer to the equator with milder winters, the prevalence tends to be lower.


It is important to note that while SAD is most commonly associated with the winter season, a smaller percentage of individuals may experience a similar pattern of depression during the spring and summer months, known as reverse SAD.


If you suspect you or someone you know may be experiencing symptoms of SAD, it is recommended to consult with a healthcare professional for an accurate diagnosis and appropriate treatment options.


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World map of Seasonal Affective Disorder

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Seasonal Affective Disorder forum

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