Seasonal Affective Disorder: Symptoms, Causes, and Treatment Options

Medically reviewed by the medical team at Harborside Psychiatry

Key Points:

• Seasonal affective disorder (SAD) is a form of depression that tends to show up in fall and winter and lift in spring and summer.
• Common signs include low mood, low energy, oversleeping, carbohydrate cravings, and pulling away from people and activities you normally enjoy.
• Less daylight can throw off your body clock and brain chemistry, which is one reason the pattern can repeat each year.
• Light therapy, medication, talk therapy, and daily lifestyle habits can all help, and they often work best together.
• Symptoms that last most of the day, nearly every day, for two weeks or more deserve a professional evaluation.
• Harborside Psychiatry offers telehealth care for patients ages 6 to 65 throughout Oregon, combining medication management and therapy from psychiatric mental health nurse practitioners in one place.

Every year, around the time the clocks change and the days get shorter, some people notice their mood starting to slide. The energy that carried them through summer fades. Getting out of bed feels harder. Comfort food and the couch start calling your name. For many people, this is just the winter blues. For others, it's something more: seasonal affective disorder.

Seasonal affective disorder, often called SAD, is a type of depression with a clear seasonal pattern. It usually starts in fall or winter and eases up in spring. It's more than feeling a little gloomy on a rainy Tuesday. It can affect work, school, relationships, and daily life.

At Harborside Psychiatry, we see how much the seasons can affect mood. Pacific Northwest winters are often gray and wet, which can make the pattern harder to shake. The good news is that seasonal depression responds well to treatment, and you don't have to push through another winter on your own.

What Is Seasonal Affective Disorder?

SAD is not listed as its own separate diagnosis. Instead, mental health professionals use a "with seasonal pattern" label for depression that follows the calendar. For that label to apply, depressive episodes need to begin and end at predictable times of year, and this pattern must happen for at least two years in a row.

In plain terms, SAD means your depression comes back on a schedule. You may feel mostly fine for much of the year, then notice your symptoms return as the days get shorter.

Signs and Symptoms to Watch For

Winter SAD often looks different from other types of depression. Many people experience:

• Low mood for most of the day, most days
• Low energy and heavy fatigue, even after a full night of sleep
• Sleeping much more than usual
• Increased appetite, especially cravings for carbohydrates and sweets
• Weight gain over the winter months
• Pulling away from friends, family, and hobbies
• Trouble concentrating or feeling mentally slowed down
• Feelings of hopelessness or worthlessness

A less common version starts in spring or summer. It often causes poor appetite, weight loss, trouble sleeping, and feeling agitated or anxious.

Symptoms usually lift as the days get longer. Even so, it's worth paying attention if you notice the same pattern year after year. A recurring pattern is a good reason to talk with a provider before the next season arrives.

Why Does Seasonal Depression Happen?

Researchers don't have one single answer, but a few factors seem to play a role:

• Less sunlight: Shorter days can shift your internal body clock, also called your circadian rhythm. When that clock is out of step, sleep, mood, and energy can all be affected.
• Melatonin: Melatonin is the hormone that helps signal sleep. In winter, your body may produce it for longer, which can leave some people feeling drowsy and heavy during the day.
• Serotonin: Light plays a role in serotonin, a brain chemical tied to mood. Lower light levels may reduce serotonin activity in some people.
• Family history: SAD can run in families, so having a relative with depression or bipolar disorder can raise your risk.

Seasonal depression is not a sign of weakness. The American Psychiatric Association notes that depression has real biological roots.

Who Is Most at Risk?

SAD can affect people of any age, including children and teens. Your risk may be higher if:

• You live farther from the equator, where winter days are noticeably shorter
• You are a woman, since SAD is diagnosed more often in women than in men
• You have a personal or family history of depression or bipolar disorder
• You have had seasonal changes in mood before

Treatment Options That Help

SAD responds well to treatment, and many people use more than one approach.

Light Therapy

Light therapy involves sitting near a bright light box, usually in the morning, for a set amount of time each day. It is a common first-line option for seasonal depression. Some light therapy devices are cleared by the U.S. Food and Drug Administration for seasonal depression, so check the device label. Talk with your provider before starting, especially if you have eye conditions or take medications that increase light sensitivity.

Medication

Antidepressants, including SSRIs, are often used for seasonal depression. Bupropion (Wellbutrin XL) is FDA-approved to help prevent seasonal depression when it's started before symptoms usually begin, so timing matters. Medication decisions are personal. Our psychiatric mental health nurse practitioners will talk through your options, keep an eye on side effects, and adjust your plan as needed.

Talk Therapy

Cognitive behavioral therapy (CBT) helps you spot thought patterns that feed low mood and build practical coping skills. Behavioral activation, a core CBT tool, encourages small, planned activities that can lift your mood even when motivation is low. Therapy can also focus on sleep habits and daily routines that support steady energy through the darker months.

Practical Tips to Get Ahead of the Winter Slump

Small habits add up. Try these steps, especially in the weeks before the season changes:

• Get outside early. Daylight helps, even on cloudy days. Try a short walk within an hour of waking up.
• Keep a steady sleep schedule. Go to bed and wake up at about the same time, including weekends.
• Move your body. Regular exercise supports both mood and sleep. Even short walks most days make a difference.
• Plan social time. Put coffee dates, game nights, or phone calls on the calendar so isolation doesn't sneak up on you.
• Eat balanced meals. Pairing protein and fiber with carbohydrates can help keep energy steadier. Limit alcohol, which can make low mood worse.
• Brighten your space. Open the blinds, sit near windows, and set up a well-lit spot for work or homework.
• Plan ahead. Many people feel better when treatment starts before symptoms peak. If you had a hard winter last year, talk with a provider now.

Ask your provider before starting any supplement, including vitamin D. They can help you decide what fits your situation.

At Harborside Psychiatry, we combine medication management, therapy, and lifestyle guidance in an integrated approach. Instead of focusing on one symptom at a time, we look at the whole picture, including sleep, daily routines, stress, and relationships.

When to Reach Out for Help

Consider a professional evaluation if:

• Low mood, fatigue, or other symptoms last most of the day, nearly every day, for two weeks or more
• Symptoms interfere with work, school, parenting, or relationships
• You are relying on alcohol or other substances to cope
• You notice the same pattern returning each season

If you ever have thoughts of harming yourself or feel unsafe, call or text 988 (Suicide and Crisis Lifeline) right away, or go to the nearest emergency room. Help is available right now.

Get Support for Seasonal Depression

You don't have to wait for spring to start feeling better. Harborside Psychiatry offers telehealth only, so you can meet with a provider from home anywhere in Oregon.

Call or text (541) 714-5610, email info@harborsidepsych.com, or book your appointment online. Our mailing address is 213 E Main Street, Rogue River, Oregon 97537, and all visits take place by secure telehealth.

FAQs About Seasonal Affective Disorder

How is SAD different from the winter blues?

Winter blues are usually mild and short-lived, and they don't stop you from functioning. SAD is a clinical depression that lasts most of the day, most days, for weeks at a time. It can interfere with work, school, and relationships.

Does seasonal affective disorder go away on its own?

Symptoms often lift in spring even without treatment. However, many people feel stuck for months before that happens. Treatment can shorten that time and help you feel more like yourself during the season.

How long do SAD symptoms usually last?

Many people notice symptoms starting in the fall and easing in the spring, though the timing varies from person to person. Some people feel changes within a few weeks of starting light therapy or therapy. Medication can take longer to reach its full effect.

Can kids and teens get seasonal affective disorder?

Yes. Children and teens can experience seasonal depression. Their signs may look more like irritability, school struggles, or changes in sleep than sadness. Harborside treats patients ages 6 to 65.

Does light therapy really work?

Light therapy is a common first-line option for seasonal depression, and many people feel better with regular use. Results vary, and it works best when used consistently at the right time of day. Your provider can help you decide whether it's a good fit.

Can I take medication only during the darker months?

Some people do this, especially when they have had the same pattern for several years. Whether a seasonal plan is right for you depends on your history, so talk with your provider rather than starting or stopping medication on your own.

Is vitamin D a treatment for seasonal affective disorder?

Vitamin D is sometimes discussed in connection with winter mood, but it is not a stand-alone treatment for SAD. Ask your provider before starting any supplement so they can review your health history and recommend what's right for you.

Can seasonal depression happen in summer?

Yes, although it is less common. Summer-pattern SAD can cause poor appetite, weight loss, trouble sleeping, and agitation. If you notice symptoms every summer, talk with a provider.

FAQs About Harborside Psychiatry

Do you treat seasonal affective disorder?

Yes. Our psychiatric mental health nurse practitioners evaluate and treat seasonal depression, including medication management and therapy.

Can I be seen from anywhere in Oregon?

Yes. All of our services are provided through secure telehealth, so you can be seen from home anywhere in Oregon.

What ages do you treat?

We treat patients ages 6 to 65 with age-appropriate care.

Do you offer both medication and therapy?

Yes. We combine medication management, therapy, and lifestyle guidance in one integrated approach, so you don't have to coordinate several providers.

Do you accept insurance?

We work with many insurance providers. Check the insurance information on our website, or call (541) 714-5610 to verify your coverage.

How do I schedule an appointment?

You can book online, call or text (541) 714-5610, or email info@harborsidepsych.com.

Stop Waiting for Spring

If the darker months are weighing on you, you don't have to keep waiting for things to improve on their own. Seasonal depression is common, understandable, and treatable. With the right combination of light, medication, therapy, and healthy habits, many people feel more like themselves again.

Ready to feel better this season? Schedule an evaluation with Harborside Psychiatry or call us at (541) 714-5610. We'll help you understand what's going on and build a plan that fits your life.

Disclaimer: The information provided on this blog is for general informational purposes only and is not intended as, and should not be considered, medical advice. All information, content, and material available on this blog are for general informational purposes only. Readers are advised to consult with a qualified healthcare professional for medical advice, diagnosis, or treatment. The author and the blog disclaim any liability for the decisions you make based on the information provided. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.