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Seasonal Affective Disorder

Seasonal affective disorder, or SAD, is a mood disorder characterized by depression related to a certain season of the year — especially winter. Two seasonal patterns, however, have been identified.  There's a fall-onset type, also called "winter depression," in which major depressive episodes begin in the late fall to early winter months and remit during the summer months. But there's also a spring-onset type, also called "summer depression," in which the severe depressive episode begins in late spring to early summer.

SAD is often not described as a separate mood disorder but as a "specifier," referring to the seasonal pattern of major depressive episodes that can occur within major depression and manic depression.

SAD is a clinical diagnosis accepted in the medical community. Norman E. Rosenthal, M.D. is the researcher credited with discovering SAD.

Women more likely to be affected

Onset usually occurs during adulthood (with the average onset occurring at approximately age 23), and is more likely to affect women than men. According to the National Mental Health Disorders Association, approximately 10 to 20 percent of the population suffers from mild winter SAD, and nearly 5 percent suffer from a more severe form of the disorder.

The symptoms and causes

The following are the most common symptoms of SAD. However, each individual may experience symptoms differently.

  • Increased sleep and daytime drowsiness

  • Irritability

  • Fatigue, or low energy level

  • Decreased sex drive

  • Diminished concentration

  • Difficulty thinking clearly

  • Increased appetite, especially for sweets and carbohydrates, causing weight gain

The symptoms of SAD may resemble other psychiatric conditions. Always see your healthcare provider for a diagnosis. Decreased sunlight is thought to be part of the cause and is under clinical investigation.

Treatment for SAD

Specific treatment for SAD will be determined by your healthcare provider based on:

  • Your age, overall health and medical history

  • Extent of the disease

  • Your tolerance for specific medications, procedures or therapies

  • Expectations for the course of the disease

  • Your opinion or preference

The treatment for "winter depression" and "summer depression" often differ. Treatment may include any, or a combination, of the following:

  • Light therapy

  • Antidepressant medications

  • Psychotherapy, such as cognitive behavioral therapy or interpersonal therapy

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