Seasonal Affective Disorder


Seasonal affective disorder is a depression related to the change in seasons, when people have SAD it normally begins and ends at the same time every year. For most people SAD occurs in the fall and continues into the winter, it is rarely found during the spring and summer. SAD is thought to be caused by the lack of light or ample amount of light.

Causes of SAD

  • Your biological clock(circadian rhythm): The decrease in sunlight may disrupt your body's internal clock which will lead you to feel depressed.
  • Serotonin levels: Serotonin is a type of brain chemical that affects a persons mood, a lack of light can cause a drop of Serotonin and lead to depression.
  • Melatonin levels: The change in melatonin levels can become unbalanced and causes your sleep patterns and mood to change.


  • Major Depression
  • Tired or low energy
  • Weight gain
  • Over sleeping
  • Poor appetite
  • Anxiety

How Does SAD affect you?

  • When you have SAD you become depressed
  • You could also have issues at work or school
  • Social withdraws
  • More likely to have suicidal thoughts or behaviors


  • Light Therapy(Phototherapy)
  • Psychotherapy
  • Medications
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Rosie O'donnell has suffered from Seasonal Affective Disorder. To manage her depression she takes medications and does inversion therapy which involves hanging upside down.

Facts about SAD:

  • It's more common for people who live farther away from the equator. This may be due to lack of sunlight during the winter and longer days during the summer months
  • SAD is more commonly found in women, but men with SAD have more sever symptoms
  • Younger people are more likely to get winter SAD, and it is uncommon for older adults to have winter SAD