Seasonal affective disorder (SAD)
Seasonal affective disorder is depression that follows a recurring seasonal pattern. It often appears during fall or winter, although a less common summer pattern also occurs. Symptoms can affect mood, energy, sleep, appetite, and everyday functioning.
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Seasonal depression involves episodes that recur at particular times of year and affect everyday tasks and functioning. Winter and summer patterns can differ. A stressful holiday or a gloomy week alone does not establish this diagnosis. [1]
Light therapy, psychotherapy, and medical treatment are among the approaches used for seasonal depression. Some people need more than one approach. A clinician can help discuss options rather than assume a seasonal change will resolve everything; light therapy does not help every person on its own. [2]
ALSO WORTH KNOWING [1]
Seasonal timing alone cannot confirm SAD. A clinician considers the full history and other possible explanations. [1]
THE CLINICAL CONVERSATION
A clinician considers when symptoms begin and ease, whether the pattern has repeated, and how it affects daily life. Depressive episodes outside that season also matter. Recording the timing can support this conversation; a calendar pattern alone does not diagnose SAD. [1]
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A FEW STRAIGHT ANSWERS
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No. Seasonal depression involves a broader pattern of mood and functioning changes, including loss of interest or pleasure. Low energy by itself is not enough to establish the diagnosis. [2]
No. Talk therapy and medical treatment may also be considered. Some people do not respond to light therapy alone, so a clinician should help review the options. [2]
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References checked November 7, 2026. This content has not been clinically reviewed for Northguard.
