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When winter arrives, many people enjoy the cool breeze, warm soups, and cozy blankets. But for some, this season brings something very different persistent sadness, lack of energy, and a dip in motivation. If you’ve ever wondered why winter feels unusually heavy or why you feel “low” every year during colder months, Seasonal Affective Disorder might be the reason.
Seasonal Affective Disorder (SAD) is a type of depression that appears during specific seasons, usually winter. Think of it as your body’s emotional response to shorter days, reduced sunlight, and colder weather.
Doctors often use the ICD 10 code F33.8 to classify seasonal depressive episodes.
It’s more than just low mood it affects sleep, appetite, energy, concentration, and relationships.
Hospitals and clinics classify SAD under:
ICD 10 Code: F33.8 Other Depressive Episodes
This code is used when depression follows a seasonal pattern, especially during winter.
Why does this matter?
Because this classification helps doctors create a treatment plan that may include light therapy, counseling, vitamin tests, and targeted therapies.
Imagine your brain as a machine that needs sunlight as fuel. When days become shorter during winter, your internal clock becomes confused.
Here are the most common reasons:
1. Reduced Sunlight
Less sunlight means lower serotonin levels, the hormone responsible for mood regulation.
2. Disrupted Biological Clock
Your circadian rhythm, or body clock, relies on day light cycles. Winter days throw it off balance.
3. Melatonin Changes
Dark winter evenings trigger more melatonin, which makes you sleepy and sluggish.
4. Vitamin D Deficiency
Sunlight is the biggest source of Vitamin D. Low levels can worsen depression symptoms.
Many people discover their Vitamin D levels are low only after a blood test. At Pathkind Labs, Vitamin D testing is one of the most commonly booked winter tests for fatigue and mood changes.
SAD symptoms may feel like typical “winter laziness,” which is why most people overlook them. But if these symptoms appear every year around the same time, it’s a sign something deeper is happening.
Common Seasonal Affective Disorder Symptoms:
1. Persistent Low Mood
You may feel sad, hopeless, or disconnected without any clear reason.
2. Low Energy & Tiredness
Even after a full night’s sleep, you may feel worn out.
3. Sleeping Too Much
Oversleeping is one of the most common SAD symptoms.
4. Changes in Appetite
Craving sweets, carbs, or comfort food more than usual.
5. Difficulty Concentrating
Simple tasks may feel exhausting or overwhelming.
6. Loss of Interest in Activities
Hobbies that you once enjoyed no longer excite you.
7. Irritability
Small things feel unusually annoying.
8. Social Withdrawal
Avoiding outings, conversations, or even family time.
9. Physical Symptoms
Headaches, heaviness in arms and legs, and sudden weight gain.
Many people describe winter as a “slow season for the mind.” I once spoke to someone who said, “I feel like winter switches off a part of my brain. Even making tea feels like a task.”
This simple sentence captures exactly how SAD affects daily life small things become big hurdles.
If you relate to this, you’re not alone, and more importantly, you’re not helpless. SAD is treatable with the right steps.
Doctors usually look for:
They may also order tests such as:
Pathkind Labs’ Healthkind Neo or Active packages often detect these deficiencies early for those experiencing winter fatigue and low mood.
Phototherapy, also known as light therapy, is one of the most effective and widely recommended treatments for SAD.
It involves sitting near a special bright light box that mimics natural sunlight.
Not just any lamp, but a medically approved one with 10,000 lux intensity.
How Phototherapy Helps:
Most people notice improvement within 1-2 weeks of daily use.
While SAD is challenging, it is absolutely manageable. Here are the most effective, science backed treatments:
1. Light Therapy (Phototherapy)
One of the top recommended treatments.
How to use it:
Sit in front of a 10,000 lux light box for 20 30 minutes every morning.
2. Vitamin D Supplements
Many people with SAD have low Vitamin D levels.
Getting your levels tested can help determine if deficiencies are worsening your symptoms.
3. Regular Exercise
Even a 30 minute walk boosts endorphins and improves mood.
If stepping outside feels too cold, indoor workouts also work well.
4. Cognitive Behavioral Therapy (CBT)
CBT helps you reframe negative thoughts and develop coping skills.
5. Spend More Time Outdoors
Sit near windows, open curtains, or get sunlight during early mornings.
6. Create a Winter Routine
Maintain fixed times for waking up, eating, working, and relaxing.
It keeps your mood steady.
7. Eat Mood Boosting Foods
Foods rich in:
These foods naturally support serotonin production.
8. Social Connection
Even short conversations with friends or family help prevent isolation.
9. Professional Help
If symptoms disrupt daily life, consult a psychologist or psychiatrist.
Many symptoms of SAD overlap with other conditions:
Before jumping to conclusions, testing helps you rule out physical causes.
Recommended tests at Pathkind Labs:
You can book these easily with Pathkind home collection.
Here are small but powerful habits that can make winter more bearable:
1. Start your morning with sunlight
Even 10 minutes helps.
2. Declutter your room
A bright, organized space boosts your mood.
3. Use warm lighting
Soft yellow lighting creates a cozy feel.
4. Try journaling
Write down three things you’re grateful for.
5. Listen to uplifting music
It immediately energizes your mind.
1. Is SAD the same as normal winter tiredness?
No. Normal tiredness goes away with rest.
SAD symptoms persist daily for weeks and affect mood, sleep, and daily function.
2. What is the Seasonal Affective Disorder ICD 10 code?
The ICD 10 Code for SAD is F33.8, listed under depressive episodes with a seasonal pattern.
3. How long does phototherapy take to work?
Most people see changes within 1 2 weeks of consistent use.
4. Can children or teenagers get SAD?
Yes. Teens often experience mood changes, but they may not express it clearly.
5. When should I see a doctor?
If your symptoms last more than two weeks or affect daily life sleep, work, relationships it's time to seek professional help.
Seasonal Affective Disorder is far more common than people realize. The good news? You can manage it effectively with awareness, lifestyle changes, and timely help. Whether you choose light therapy, a daily walk in the sunlight, or simple mood boosting habits, every small step helps.
If your symptoms feel persistent or unusually heavy, a quick health screening for Vitamin D, thyroid, or anemia through Pathkind Labs can help you understand what is happening inside your body.
Winter may feel long, but your low mood doesn’t have to last with it.
Discover precision diagnostics with Pathkind Labs, a trusted name in diagnostic services in India. Our NABL accredited labs, equipped with advanced technology, are staffed by a certified team of over 200+ senior pathologists and 2000+ technicians. From tailored health check-ups to specialized tests in Oncology, Neurology, Gynaecology, Nephrology, and more, we've got your health covered. Skip the hassle with online booking for tests or check-ups, available for both lab visits and at-home blood collection. For a seamless experience and early detection, choose Pathkind Labs in Gurugram. Book your appointment today and experience diagnostics made easy.
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