Seasonal affective disorder is depression characterised by symptoms which recur every winter and is thought to be due to lack of sunshine. According to SADA (SAD Association) an estimated one million people are affected in the UK and perhaps up to ten million have a milder form of the disorder. Some people with SAD are seriously disabled during winter months and some exhibit depression. Symptoms include mood changes, anxiety, irritability, depression, reduced concentration, lethargy and fatigue despite increased sleep. These symptoms may occur in women who assume that they have PMS.
There is some evidence that light therapy may reduce symptoms.
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