What type of mood disorder is Seasonal Affective Disorder (SAD) classified as?

• A. Anxiety disorder
• B. Type of depression
• C. Personality disorder
• D. Bipolar disorder

Answer: (B)

Seasonal Affective Disorder (SAD) is classified as a type of depression. This disorder is characterized by the onset of depressive symptoms that occur at a specific time of year, usually in the fall or winter months when there is less natural sunlight. The symptoms may include feelings of sadness, lethargy, changes in sleep patterns, weight gain, and difficulty concentrating, which are all hallmark signs of depressive disorders. The seasonal aspect of SAD differentiates it from other types of depression, as these symptoms typically recede during the spring and summer months when daylight increases.

SAD is thought to be related to changes in light exposure, which can affect melatonin and serotonin levels in the brain, thereby influencing mood and behavior. This seasonal pattern is what leads to its classification distinctly as a depression rather than an anxiety disorder, a personality disorder, or bipolar disorder, which are categorized differently based on their unique characteristics and symptomatology.