Seasonal
Affective Disorder
SAD is major depression that follows the calendar — most often starting in autumn or winter and lifting in spring. Because the timing is predictable, it's one of the few depressions you can treat before it arrives.
What is seasonal affective disorder?
Seasonal affective disorder is major depression with a seasonal pattern — most commonly autumn or winter onset with spring remission. Bright light therapy, typically 10,000 lux for around 30 minutes each morning, has strong evidence and is often first-line. Bupropion XL is FDA-approved for the prevention of seasonal major depressive episodes, started in autumn before symptoms begin. Dr. Farkas builds preventive plans that start ahead of the vulnerable season.
One thing is worth getting straight first: SAD is not a standalone diagnosis. In DSM-5-TR it is a seasonal pattern specifier applied to recurrent major depressive disorder — or to bipolar disorder, which matters more than it sounds. Establishing the pattern requires a history across multiple years showing episodes that reliably begin and remit at particular times, rather than one bad winter.
The presentation often looks atypical compared with other depressions. Rather than insomnia and appetite loss, winter-pattern SAD tends to bring oversleeping, increased appetite with carbohydrate craving, weight gain, and a heavy, slowed-down quality. People frequently describe it as hibernation rather than sadness, which is part of why it goes unnamed for years.
Treatment has an unusual advantage: predictability. Bright light therapy is well established, with the usual regimen being around 30 minutes of daily exposure to 10,000 lux, generally in the morning. On the medication side, bupropion XL is the first and only agent FDA-approved for preventing seasonal major depressive episodes. The approved label is specific about timing: initiate in the autumn before depressive symptoms begin, continue through the winter, then taper and discontinue in early spring, with timing individualized to the patient's own historical pattern.
There is a safety consideration that gets skipped. Bright light therapy, like any effective antidepressant treatment, can precipitate hypomania or mania in susceptible people. Screening for a history of elevated or high periods before starting light therapy is not a formality, particularly given how often seasonal mood change turns out to sit within a bipolar pattern.
Several conditions produce winter fatigue and low mood: hypothyroidism, anemia, vitamin D deficiency, sleep apnea, and non-seasonal depression that simply happens to coincide. Each needs excluding before the seasonal label is applied and a preventive plan built around it.
Dr. Farkas brings MD/PhD neuroscience training, NIH research center experience, and board-certified psychiatric practice to that work. Her 30–60 minute evaluations document the pattern properly before anything is planned around it.
What an evaluation establishes
Classified in the DSM-5-TR as major depressive disorder with a seasonal pattern. This page is educational and is not a diagnostic tool.
How Dr. Farkas treats seasonal depression
Evidence-based, neurobiologically informed, and timed to the season rather than to the crisis.
Medications and devices named here are described for general educational purposes only and are not recommendations. Light therapy and prescribing decisions require individual evaluation by a physician.
What to expect from your first appointment
A new patient evaluation with Dr. Farkas runs 30–60 minutes. It covers your mood history year by year, when episodes typically start and lift, sleep and appetite changes, any history of elevated or high periods, prior treatments including light therapy, and every medication tried.
You'll leave knowing whether the seasonal pattern is established, what your options are, and — importantly — when to start next time. Telehealth is available throughout South Carolina and New York. In-person appointments are available at the Bluffton, SC office.
Related Conditions
Call or text 988 (Suicide & Crisis Lifeline). Text HOME to 741741 for the Crisis Text Line. Call 911 or go to your nearest emergency room if you are in immediate danger.
Medical disclaimer: This page is for educational purposes and does not constitute medical advice. No doctor–patient relationship is established through website use. Medications and light therapy devices named here are described for general educational purposes only and are not recommendations; treatment decisions require individual evaluation. Individual results vary; no specific outcome is guaranteed. Telehealth visits are conducted on a HIPAA-compliant platform. Gabriella I. Farkas, MD PhD, is a board-certified psychiatrist licensed in South Carolina and New York.
Plan for winter
before it arrives
30–60 minutes. The seasonal pattern documented. A preventive plan with a start date.
Seasonal affective disorder (SAD) is major depression with a seasonal pattern — most commonly fall/winter onset with spring remission. Bright light therapy (10,000 lux for 20–30 minutes each morning) has strong evidence and is often first-line. SSRIs and bupropion XL (FDA-approved for SAD prevention) are effective. Dr. Farkas builds preventive protocols starting before the vulnerable season.
Key Takeaways
- Seasonal affective disorder is depression with a seasonal pattern, most often starting in fall or winter and lifting in spring.
- Bright light therapy each morning has strong evidence and is often the first step.
- Bupropion XL is FDA-approved to prevent seasonal episodes when started before the vulnerable season.
- A smaller group has a summer pattern, with insomnia, agitation, and reduced appetite instead.
Frequently Asked Questions
How does light therapy work?
Bright light exposure — 10,000 lux for 20–30 minutes soon after waking — likely acts on circadian rhythm and serotonergic systems. Effects typically emerge within 1–2 weeks. Adherence to timing and duration is important.
Is bupropion XL FDA-approved for SAD?
Yes — bupropion XL is FDA-approved for the prevention of major depressive episodes in patients with a history of seasonal affective disorder. Started before the vulnerable season, it reduces episode incidence.
Can SAD occur in summer?
Yes — a minority of patients experience summer-pattern SAD with symptoms including agitation, insomnia, and appetite loss (contrasting with the hypersomnia and appetite increase typical of winter SAD).