MedlinePlus Health Information: A service of the National Library of Medicine and the National Institutes of Health

Seasonal Affective Disorder

URL of this page: http://www.nlm.nih.gov/medlineplus/seasonalaffectivedisorder.html

Also called: Also called: SAD, Seasonal depression, Seasonal mood disorder

Some people experience a serious mood change when the seasons change. They may sleep too much, have little energy, and crave sweets and starchy foods. They may also feel depressed. Though symptoms can be severe, they usually clear up. This condition is seasonal affective disorder (SAD). It usually happens during the winter. A less common type of SAD happens in the summer.

What causes SAD? Some experts think it's a lack of sunlight during winter, when the days are shorter. In the United States, it is much more common in northern states. Light therapy, in which patients expose themselves to a special type of light for 30 minutes every day often helps. Other treatments include

Start Here Overviews Latest News Treatment Coping Related Issues Clinical Trials Research Journal Articles
References and abstracts from MEDLINE/PubMed (National Library of Medicine)
Organizations Teenagers You may also be interested in these MedlinePlus related pages:

The primary NIH organization for research on Seasonal Affective Disorder is the National Institute of Mental Health - http://www.nimh.nih.gov/

Date last updated: September 03 2008
Topic last reviewed: June 09 2008