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Seasonal affective disorder

A type of depression that follows the seasons, most often starting in late fall or early winter and lifting in spring and summer.

What It Means

Seasonal affective disorder (SAD) is a type of depression that comes and goes with the seasons. The National Institute of Mental Health (NIMH) explains that in most cases symptoms start in late fall or early winter and ease in spring and summer, a pattern called winter-pattern SAD or winter depression. It carries the symptoms of depression, lasting at least two weeks, and it can be treated.

Try It: Check the Winter-Pattern Signs NIMH Lists

Tick what has shown up for you in recent winters. This isn't a diagnosis; it helps you describe the pattern to a doctor.

Signs ticked0
Out of6

Nothing ticked. If the season still feels hard, it's fine to bring it up with a doctor.

How People Say It

  • "Every November I just shut down until spring."
  • "It hits me every year, right around the time change."
  • "My doctor suggested a light box for my seasonal depression."

The Breakdown

Signs, from NIMH

Depression symptoms (at least 2 weeks)Added in the winter pattern
Sad, anxious or empty mood most of the dayOversleeping
Hopelessness, guilt or irritabilityOvereating, especially carbohydrates, with weight gain
Loss of interestInterest rateThe yearly percentage a lender charges for borrowing money, not counting fees; the APR adds certain fees to show a fuller cost. See more in hobbiesPulling away from people, wanting to hibernate
Low energy, trouble concentrating, sleep or appetite changes, aches

A short self-check. Look back at the last two or three years. If the same low stretch arrived around the same month and lifted in spring, write down when it started and ended. That timeline is useful at a doctor's visit.

How it's treated. Reviews of the research in PubMed Central describe light therapy, using a special light box that mimics daylight, as an established treatment for winter-pattern SAD, along with talk therapy such as cognitive behavioral therapy (CBT) and antidepressant medicine. Which one fits, and how a light box should be used, is a decision to make with a clinician.

Starting the conversation. With your doctor: "For the past few winters I've felt low and exhausted from about November to March. Could this be seasonal depression?"

Good to Know

Talk with a doctor or licensed mental health professional before starting light therapy. They can confirm whether it's SAD or something else, and recommend the kind of light box, the time of day and how long to use it; it isn't a do-it-yourself treatment. NIMH's broader advice on depression applies too: symptoms most of the day, nearly every day, for two weeks or more are worth getting checked. The circadian rhythmCircadian rhythmThe body's roughly 24-hour cycle of physical, mental and behavioral changes, such as sleepiness at night, kept in time by a clock in the brain that follows light. See more page explains how light sets the body's daily clock. If you're having thoughts of suicide or are in crisis, call or text 988 (the 988 Suicide and Crisis Lifeline), and call 911 in an emergency.

FAQ

What are the symptoms of seasonal affective disorder?

NIMH lists the usual signs of depression, lasting at least two weeks, and for the winter pattern adds oversleeping, overeating with carbohydrate cravings and weight gain, and social withdrawal. The symptoms usually begin in late fall or early winter.

Does light therapy work for SAD?

Research reviews describe light therapy with a light box as an established treatment for winter-pattern SAD. Start it with a doctor's guidance, since the right box, timing and length matter.

Is SAD the same as the winter blues?

SAD is a type of depression, and NIMH describes symptoms that last at least two weeks, most of the day, nearly every day. If a low stretch like that returns each winter, see a doctor rather than waiting for spring.

Do It in Buhata

Notes (Premium) and Reminders

Write a one-line mood note each day in Notes (Premium) in Buhata from October to March, and set a Reminder for early fall to book a check-in with your doctor if winters have been hard.

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Related Terms and Categories

  • Mood tracker

    A daily record of how your mood was, often a number or a color for each day, kept to spot patterns over weeks and months.

  • Circadian rhythm

    The body's roughly 24-hour cycle of physical, mental and behavioral changes, such as sleepiness at night, kept in time by a clock in the brain that follows light.

  • Sleep hygiene

    The everyday habits and bedroom setup that make it easier to fall asleep and stay asleep, like a steady wake-up time and a quiet, cool room.

  • Self-care

    Taking time to do things that help you live well and look after your physical and mental health, such as moving, sleeping, resting and staying in touch.

  • Loneliness

    The painful feeling that you lack close, meaningful relationships or a sense of belonging, whether or not other people are around you.

  • Postpartum depression

    Depression that begins in the weeks or months after a baby is born, up to a year, lasting 2 weeks or longer and stronger than the baby blues.

Wellbeing and habits

Sources

National Institute of Mental Health, "Seasonal Affective Disorder"; "Seasonal Affective Disorder: An Overview of Assessment and Treatment Approaches" (PubMed Central); "Treatment of Seasonal Affective Disorder. The efficacy of Light therapy" (PubMed Central); 988 Suicide and Crisis Lifeline

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