Many people may feel low when the weather changes - but if you feel sad for most of the day, you might have seasonal affective disorder.
SAD is a type of depression that affects people mainly during the winter. Around 1 in 20 people have been diagnosed with it. It is more likely that about 10% of people suffer from SAD but don’t think their symptoms are anything more than the winter blues.
The exact reasons people suffer are unknown and the same factors might affect everyone differently. Research has shown that changes to your circadian rhythm, serotonin levels and melatonin play an important role in regulating your happiness through the seasons, reports Wales Online.
