Most people experience SAD during the winter. Less commonly, some people find they experience SAD in reverse – with depressive symptoms occurring in summer.
SAD is most common in countries like the UK where there are large changes in the weather and daylight hours in the different seasons.
It's like having your own portable black cloud.
SAD can also worsen symptoms of existing depression that you experience throughout the year.
This information was published in June 2016. We will revise it in 2019.