What is Seasonal affective disorder?
'''Seasonal affective disorder''' (SAD),<ref>{{Cite web|date=2021-02-12|title=Overview - Seasonal affective disorder (SAD)|url=https://www.nhs.uk/mental-health/conditions/seasonal-affective-disorder-sad/overview/|access-date=2024-05-21|website=nhs.uk|language=en}}</ref> also called winter depression, winter blues, summer depression and seasonal depression, is a [[mood disorder]] that happens in people who have normal mental health throughout most of the year. They show [[Depression (mental illness)|depressive]] symptoms at the same time each year, usually in the winter.<ref>{{Cite news|url=https://www.nytimes.com/2002/08/13/health/seasonal-depression-can-accompany-summer-sun.html|title=Seasonal Depression Can Accompany Summer Sun|last=Ivry|first=Sara|date=2002-08-13|newspaper=The New York Times|accessdate=2017-12-04|language=en-US|issn=0362-4331}}</ref><ref>{{Cite journal|last1=Oginska|first1=Halszka|last2=Oginska-Bruchal|first2=Katarzyna|date=2014-05-01|title=Chronotype and personality factors of predisposition to seasonal affective disorder|url=https://doi.org/10.3109/07420528.2013.874355|journal=Chronobiology International|volume=31|issue=4|pages=523–531|doi=10.3109/07420528.2013.874355|pmid=24397301|s2cid=22428871|issn=0742-0528}}</ref> == Cause and Symptoms == Some people think that SAD is related to not having enough [[serotonin]] because they don't get enough sunlight, which could cause serotonin polymorphisms. Serotonin polymorphisms could be the cause in SAD,<ref>{{Cite journal|last1=Johansson|first1=C.|last2=Smedh|first2=C.|last3=Partonen|first3=T.|last4=Pekkarinen|first4=P.|last5=Paunio|first5=T.|last6=Ekholm|first6=J.|last7=Peltonen|first7=L.|last8=Lichtermann|first8=D.|last9=Palmgren|first9=J.|date=2001-04-01|title=Seasonal Affective Disorder and Serotonin-Related Polymorphisms|url=http://www.sciencedirect.com/science/article/pii/S0969996100903735|journal=Neurobiology of Disease|volume=8|issue=2|pages=351–357|doi=10.1006/nbdi.2000.0373|pmid=11300730|s2cid=10841651}}</ref> although it has been disput