Seasonal affective disorder (SAD): Part 1 – history, epidemiology, aetiology and diagnosis

Author(s):
Professor John M. Eagles and Dr Allen J. Shand

Duration:
45 minutes

Credits:
0.75

Published:
September 2025

Type:
CPD learning module

CPD domain:
Clinical

Seasonal affective disorder (SAD) Part 1.jpg

The idea that our well-being fluctuates with the seasons has been around for literally thousands of years, but it was only in the late 1980s that Norman Rosenthal and colleagues gave a name to seasonal affective disorder or SAD.

In this module, we will look at:

  • the history and evolution of SAD
  • the epidemiology and aetiology of SAD
  • symptoms of SAD and diagnosis.
Learning objectives

By the end of the module, you should be able to:

  • describe the history and evolutionary theory of SAD
  • outline the aetiology and epidemiology
  • list the symptoms and differential diagnosis.
Availability

This module is available as part of a CPD eLearning subscription.



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