Seasonal affective disorder

Seasonal affective disorder (SAD) is a type of depression that occurs with a seasonal pattern, typically starting in fall and continuing through winter, and it affects many people's mood and energy levels. Studies have found that SAD is more common in regions farther from the equator, where daylight hours are significantly reduced during winter months. Light therapy, which involves exposure to bright artificial light, has been consistently effective in reducing symptoms of SAD. Additionally, cognitive-behavioral therapy (CBT) and antidepressant medications like selective serotonin reuptake inhibitors (SSRIs) have also shown benefits for managing the condition.

SAD is closely linked to circadian rhythms and melatonin production, which are influenced by light exposure. People with SAD often experience disrupted sleep patterns and changes in appetite, leading to weight gain. The disorder can significantly impact daily functioning and quality of life, making it important to seek appropriate treatment.

While the evidence for effective treatments like light therapy and CBT is strong, more research is needed to fully understand the underlying mechanisms of SAD and to develop personalized treatment approaches.

Sources

• Seasonal Affective Disorder: Common Questions and Answers. (PMID:33252911)
• Forty years of seasonal affective disorder. (PMID:39863986)
• Seasonal affective disorder. (PMID:9802288)
• Seasonal affective disorder. (PMID:23198671)
• Seasonal affective disorder. (PMID:17111890)
• Seasonal affective disorder. (PMID:22608628)

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