The symptoms of seasonal affective disorder (SAD) are similar to those of normal depression, but they occur repetitively at a particular time of year.
They usually start in the autumn or winter and improve in the spring.
The nature and severity of SAD varies from person to person. Some people just find the condition a bit irritating, while for others it can be severe and have a significant impact on their day-to-day life.
Signs that you may be depressed include:
A small number of people will experience these symptoms in phases that are separated by "manic" periods where they feel happy, energetic and much more sociable.
In addition to symptoms of depression, you may also:
These symptoms may make everyday activities increasingly difficult.
You should see your GP if you think you might have SAD and you're finding it difficult to cope.
There are a number of helpful treatments your GP may be able to recommend.