By Dr Vasilios Silivistris
Seasonal affective disorder (SAD) is an older term for a major depressive disorder (MDD) with a seasonal pattern.
It is a psychological condition that results in depression, normally provoked by seasonal change. People typically experience the condition in winter. The condition most often occurs in women, adolescents and young adults however, it can affect people of all ages.
What are the causes?
The exact cause of
