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.acv-opsrow{grid-template-columns:1fr 1fr}}</style><div class="acv-root"><p class="acv-dek">NIMH sorts every treatment for seasonal affective disorder into four categories. Knowing which one is which is most of the work.</p><p class="acv-meta">Ageless Coach Editorial Team · September 3, 2026</p><div class="acv-glance"><div class="acv-gt">In 30 Seconds</div><div class="acv-item"><b>Four categories, not forty.</b> NIMH says treatments for SAD fall into four main categories that can be used alone or in combination: light therapy, psychotherapy, antidepressant medication and vitamin D. <span class="acv-s">NIMH</span></div><div class="acv-item"><b>It is not the winter blues.</b> Cleveland Clinic says about 5 percent of US adults have SAD, while 10 to 20 percent get a milder winter slump. Full SAD is classed as major depressive disorder with a seasonal pattern. <span class="acv-s">Cleveland Clinic</span></div><div class="acv-item"><b>The light has to be bright.</b> NIMH describes a 10,000 lux light box used for about 30 to 45 minutes, first thing in the morning, from fall to spring. <span class="acv-s">NIMH</span></div></div><div class="acv-body"><p class="acv-dropcap">Seasonal affective disorder has four proven treatment categories, and NIMH names all four.</p><p>Shorter days shift the internal clock that sets mood, sleep and hormones. In people prone to it, that shift tips into depression. It arrives and leaves with the calendar.</p><p>Below are the four treatments. Then the numbers that make light therapy work, and the line between a rough winter and a diagnosis.</p><div class="acv-band"><div class="acv-inner"><div class="acv-big">1</div><div><div class="acv-q">The Treatments · 4</div><h3>Four treatments, and only two are for winter</h3></div></div></div><p><a href="https://www.nimh.nih.gov/health/publications/seasonal-affective-disorder" target="_blank" rel="noopener">NIMH</a> says treatments for SAD fall into four main categories. They can be used alone or in combination.</p><p>The split matters. Two of the four aim at winter pattern SAD. The other two treat depression in general.</p><ol class="acv-signlist"><li><b>Light therapy.</b> A mainstay since the 1980s. The person sits in front of a very bright light box every morning through the dark months. NIMH says it is for winter pattern SAD.</li><li><b>Psychotherapy.</b> Talk therapy teaches new ways of thinking and behaving. Cognitive behavioral therapy has been adapted for SAD. It treats depression in general, both patterns.</li><li><b>Antidepressant medication.</b> Also used for depression in general. NIMH lists it as one of the four and says a provider weighs the benefits and risks with you.</li><li><b>Vitamin D.</b> The fourth category, and like light therapy it is aimed at winter pattern SAD. NIMH names it alongside the other three rather than above them.</li></ol><div class="acv-billboard"><div class="acv-n">4</div><div class="acv-d">NIMH says treatments for seasonal affective disorder fall into four main categories that can be used alone or in combination.</div><div class="acv-c">Source: NIMH</div></div><p>Notice what is not on the list. There is no treatment specific to summer pattern SAD, and NIMH says so plainly.</p><p>Notice also that vitamin D sits beside the other three, not underneath them.</p><div class="acv-band"><div class="acv-inner"><div class="acv-big">2</div><div><div class="acv-q">The Numbers</div><h3>Light therapy only works at the right dose</h3></div></div></div><p>A light box is not a lamp. NIMH describes a box rated at 10,000 lux. That is about 20 times brighter than ordinary indoor light.</p><p>The session runs about 30 to 45 minutes, usually first thing in the morning, from fall through spring.</p><figure><img src="https://images.pexels.com/photos/7155948/pexels-photo-7155948.jpeg?auto=compress&cs=tinysrgb&w=1400&h=560&fit=crop" alt="A person sitting alone on a bench facing an empty winter field under a pale sky"><figcaption>NIMH says winter pattern SAD symptoms last about four to five months out of the year.</figcaption></figure><p>The box filters out UV light, which is what makes it safe for most people.</p><p>Most, not all. NIMH says some people need supervision or a different treatment. That includes people with certain eye diseases and people on medicines that raise light sensitivity.</p><div class="acv-pullquote"><p>Treatments are available to help people with SAD. They fall into four main categories that can be used alone or in combination.</p><div class="acv-who">NIMH</div></div><div class="acv-capture ac-capture" data-state="trigger" id="cap" data-article-slug="seasonal-affective-disorder-4-treatments-that-work-and-why-it-is-not-the-winter-blues" data-pdf-url="https://cdn.prod.website-files.com/69be1026a027224999b7936b/6a996d993e17af02a0333206_seasonal-affective-disorder-4-treatments-that-work-and-why-it-is-not-the-winter-blues-plan.pdf" data-plan-title="The Seasonal Affective Disorder Plan" data-plan-desc="The four treatment categories NIMH lists, how bright a light box has to be and when to sit in front of it, the line between winter blues and a diagnosis, and the symptoms that mean call a provider now. Checked against NIMH, Cleveland Clinic and Mayo Clinic."><div class="st-trigger cap-state"><div class="acv-cap-grid"><div><h4>Take the four treatments with you</h4><p class="acv-sub">One printable sheet: the four treatment categories, the light box numbers, the winter blues line, and the symptoms that need a provider. Free, unlocked right here.</p><button class="acv-bigbtn" type="button" data-cap="form">📄 Print My Plan (Free PDF)</button><div class="acv-fine">Joins the free weekly Ageless Brief. Unsubscribe anytime.</div></div><div class="acv-chartcard" aria-hidden="true"><div class="acv-ch-mast">SEASONAL AFFECTIVE DISORDER: FOUR TREATMENTS, ONE LINE</div><div class="acv-ch-sub">AGELESS COACH · CHECKED AGAINST NIMH · CLEVELAND · MAYO</div><div class="acv-ch-cols"><div class="acv-ch-col"><div class="acv-ch-h acv-ok">✓ DO THIS</div><div class="acv-ch-row acv-ok"></div><div class="acv-ch-row acv-ok acv-short"></div><div class="acv-ch-row acv-ok"></div><div class="acv-ch-row acv-ok acv-short"></div></div><div class="acv-ch-col"><div class="acv-ch-h acv-no">✗ DO NOT</div><div class="acv-ch-row acv-no"></div><div class="acv-ch-row acv-no acv-short"></div><div class="acv-ch-row acv-no"></div><div class="acv-ch-row acv-no acv-short"></div></div></div><div class="acv-ch-band"></div></div></div></div><div class="st-form cap-state"><h4>Enter your email to unlock your plan</h4><p class="acv-sub">Your 1-page seasonal affective disorder plan, unlocked right here.</p><form class="capform"><input type="email" name="email" placeholder="Your email address" aria-label="Email address" required><button type="submit">Unlock My Plan (Free)</button></form><div class="acv-fine">No spam. One short evidence brief each week. Unsubscribe anytime.</div></div><div class="st-sent cap-state"><div class="acv-sent-check">✓</div><h4>Your plan is ready</h4><p class="acv-sub">Download or print it below. Save it anywhere.</p><a class="dl" href="https://cdn.prod.website-files.com/69be1026a027224999b7936b/6a996d993e17af02a0333206_seasonal-affective-disorder-4-treatments-that-work-and-why-it-is-not-the-winter-blues-plan.pdf" download>⬇ Download your plan (PDF)</a><div class="acv-fine">Your first Ageless Brief arrives this week: one study, translated, no hype.</div></div></div><div class="acv-band"><div class="acv-inner"><div class="acv-big">3</div><div><div class="acv-q">The Line</div><h3>Where the winter blues stop and SAD starts</h3></div></div></div><p><a href="https://my.clevelandclinic.org/health/diseases/9293-seasonal-depression" target="_blank" rel="noopener">Cleveland Clinic</a> says about 5 percent of adults in the United States have SAD, and 10 to 20 percent may get a milder form of the winter blues.</p><p>The difference is not intensity of feeling. It is function.</p><figure><img src="https://images.pexels.com/photos/8171175/pexels-photo-8171175.jpeg?auto=compress&cs=tinysrgb&w=1400&h=560&fit=crop" alt="Two women sitting face to face in conversation in a bright room"><figcaption>Cognitive behavioral therapy has been adapted specifically for seasonal affective disorder.</figcaption></figure><div class="acv-billboard"><div class="acv-n">10,000 lux</div><div class="acv-d">NIMH describes a light box rated at 10,000 lux, about 20 times brighter than ordinary indoor light, used 30 to 45 minutes each morning.</div><div class="acv-c">Source: NIMH</div></div><p>Cleveland Clinic says full SAD goes beyond the winter blues. It affects daily life, including how you feel and think. The American Psychiatric Association classes it as major depressive disorder with seasonal patterns.</p><p><a href="https://www.mayoclinic.org/diseases-conditions/seasonal-affective-disorder/symptoms-causes/syc-20364651" target="_blank" rel="noopener">Mayo Clinic</a> puts the trigger for a visit in plain words. See a provider if you feel down for days at a time. Same if you cannot get motivated to do things you normally enjoy.</p><p>Mayo says this matters most if your sleep and appetite have changed. It also matters if you turn to alcohol for comfort, or feel hopeless.</p><p>SAD symptoms run about four to five months of the year. Waiting it out is a long bet.</p><div class="acv-band acv-hype"><div class="acv-inner"><div class="acv-big">✗</div><div><div class="acv-q">Sorted</div><h3>Three seasonal depression beliefs that do not hold</h3></div></div></div><p>Three ideas send people to the wrong fix, and each one has a published answer.</p><p><strong>It is the same thing as holiday stress.</strong> NIMH says the depression in SAD is related to changes in daylight hours, not the calendar. Stress from holidays, family visits or school schedules is not the same thing.</p><p><strong>Only cold northern winters cause it.</strong> Mayo Clinic lists living far from the equator as a risk factor. It ties that to less winter sunlight, not to cold. Latitude is the variable, not the thermometer.</p><p><strong>It only happens in winter.</strong> Cleveland Clinic and NIMH both describe a summer pattern. It is less common. Its symptoms run the other way: insomnia, poor appetite, weight loss, restlessness and agitation.</p><div class="acv-plan ac-plan" id="coach-recommendations"><div class="acv-ptitle"><span class="acv-ico">📋</span>Your Coach's Recommendations</div><div class="step"><div class="acv-n">1</div><div><div class="sh">Name the pattern before you name the fix.</div><div class="sd">NIMH separates winter pattern from summer pattern SAD. Light therapy and vitamin D are aimed at winter pattern. Write down the month your mood shifts and the month it lifts, for two years running if you have it.</div></div></div><div class="step"><div class="acv-n">2</div><div><div class="sh">Ask about all four categories, not one.</div><div class="sd">NIMH lists light therapy, psychotherapy, antidepressant medication and vitamin D, and says they can be used alone or in combination. Bring the list to the appointment so the conversation covers the whole menu.</div></div></div><div class="step"><div class="acv-n">3</div><div><div class="sh">Treat the light box as a dose, not a decoration.</div><div class="sd">NIMH describes 10,000 lux for about 30 to 45 minutes, first thing in the morning, from fall to spring. If you have an eye condition or take a medicine that raises light sensitivity, ask before you start.</div></div></div><div class="acv-pdiv"></div><button class="acv-calbar" type="button" data-ac-cal>📅 Add <i>Your Coach's Recommendations</i> to Your Calendar <span class="acv-qm">?</span></button><div class="acv-opsrow"><button type="button" data-ac-share>⇮ Share</button><button type="button" data-ac-savepdf>📄 Save PDF</button><button type="button" data-ac-print>🖨 Print</button></div></div><div class="acv-sig"><p class="acv-toyour">To your health,</p><div class="acv-row"><svg class="acv-glyph" viewBox="0 0 40 40" aria-hidden="true"><circle cx="20" cy="20" r="18" fill="none" stroke="#0D1B2A" stroke-width="3"/><path d="M13 28 L20 11 L27 28 M16 22 H24" fill="none" stroke="#0D1B2A" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg><p class="acv-name">Ageless Coach</p></div><p class="acv-tag">Age Strong. Live Long.</p></div><div class="acv-trust"><div class="acv-t">Trusted Sources Behind This Article</div><a href="https://www.nimh.nih.gov/health/publications/seasonal-affective-disorder" target="_blank" rel="noopener">NIMH</a><a href="https://my.clevelandclinic.org/health/diseases/9293-seasonal-depression" target="_blank" rel="noopener">Cleveland Clinic</a><a href="https://www.mayoclinic.org/diseases-conditions/seasonal-affective-disorder/symptoms-causes/syc-20364651" target="_blank" rel="noopener">Mayo Clinic</a></div><p class="acv-disclaimer">This article is education, not medical advice. Mayo Clinic says to see a health care provider if you feel down for days at a time, cannot get motivated for activities you normally enjoy, notice changes in sleep or appetite, turn to alcohol for comfort, or feel hopeless. If you are having thoughts of suicide, call or text 988 in the United States. Ageless Coach is an affiliate partner and may earn a commission on purchases made through links on this page.</p><div class="acv-faq"><h2>Frequently Asked Questions</h2><details><summary>How do I know if I have SAD or just hate winter?</summary><div class="acv-a">Cleveland Clinic draws the line at function. The winter blues are normal and mild. Full SAD is a form of depression that affects daily life, including how you feel and think. Mayo Clinic says to see a provider if you feel down for days at a time and cannot get motivated for things you normally enjoy.</div></details><details><summary>How long do SAD symptoms usually last?</summary><div class="acv-a">NIMH says symptoms last about four to five months out of the year. In most cases they start in late fall or early winter and go away in spring and summer.</div></details><details><summary>Does a regular bright lamp work as well as a light box?</summary><div class="acv-a">NIMH describes a light box rated at 10,000 lux, roughly 20 times brighter than ordinary indoor light, and says it filters out potentially damaging UV light. Ordinary room lighting is not in that range.</div></details><details><summary>Can I just take vitamin D instead of seeing anyone?</summary><div class="acv-a">Vitamin D is one of the four categories NIMH lists, not a replacement for the other three. NIMH advises talking with a health care provider about the benefits and risks of each option before choosing.</div></details><details><summary>Is there a summer version of this?</summary><div class="acv-a">Yes, and NIMH calls it summer pattern SAD. It is less common and the symptoms differ: trouble sleeping, poor appetite with weight loss, restlessness, anxiety, and in some cases aggressive behavior.</div></details><details><summary>Who is most likely to get it?</summary><div class="acv-a">Mayo Clinic says SAD is diagnosed more often in women than in men and occurs more often in younger adults than older adults. Cleveland Clinic says it tends to start between ages 18 and 30.</div></details></div><div class="acv-secondary">Wondering where you stand overall? <a href="/#assessment">Take the free 5-minute Healthspan Snapshot</a> and see your strongest and weakest of six dimensions.</div></div></div>
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