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Psychologist Ethem Tozbay
Psychologist Ethem Tozbay
27 February 2026Adult Psychology6 min read
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What is Seasonal Depression? (Seasonal Affective Disorder)

What is Seasonal Depression? (Seasonal Affective Disorder)

What is seasonal depression, also known as winter depression? Ways to cope with fatigue, loss of energy, and depression that occur in the autumn and winter months.

Key Takeaways

  • Seasonal depression occurs mainly in the autumn and winter months due to the disruption of the serotonin-melatonin balance in the brain caused by reduced daylight.
  • Constant fatigue, excessive desire to sleep, carbohydrate-heavy diet, and social isolation are its most prominent symptoms.
  • With light counseling, regular exercise, benefiting more from daylight, and psychological support, symptoms can be significantly alleviated.

What is Seasonal Depression? Symptoms, Causes, and Effective Ways to Cope

Seasonal depression is a mood disorder that occurs with the decrease of daylight, especially in autumn and winter months, and significantly reduces mood, energy, and daily quality of life. Seasonal depression (Seasonal Affective Disorder - SAD), also known as "winter depression" among the public, is not just a temporary state of sadness; it is a clinical condition that affects many areas from sleep patterns to appetite, from motivation to social relationships. It can be seen more frequently especially in regions where the daylight duration decreases in winter, such as Turkey, and according to research, 1 in every 10 people can experience mild or moderate seasonal depression symptoms.

What is Seasonal Depression and How Does It Emerge?

Seasonal depression is a type of depression that occurs during certain periods of the year, especially with the decrease of daylight. This condition usually starts in the autumn months and continues throughout the winter. When the serotonin and melatonin balance in the brain changes, mood is directly affected, and the person may feel more reluctant, tired, and withdrawn. Especially the constant desire to sleep and loss of energy draw attention among the symptoms of seasonal depression.

Clinical studies show that approximately 5-10% of people worldwide are affected by seasonal mood changes according to World Health Organization (WHO) data. This rate is even higher in northern countries because the sunlight duration is shorter. This situation proves that our biological rhythm is directly connected to sunlight.

In summary: Seasonal depression is not just a psychological state, but an adaptation problem directly related to our biological clock.

Seasonal Depression Symptoms and Their Effects on Daily Life

Although seasonal depression symptoms vary from person to person, they generally show a similar pattern. This condition, which occurs especially in winter months, is felt at both physical and psychological levels. Daily life performance can significantly decrease, and the person can withdraw from social life.

What are the symptoms of seasonal depression?

  • Constant fatigue and low energy
  • Excessive desire to sleep during the day
  • Carbohydrate-based diet and weight gain
  • Withdrawing from social relationships
  • Loss of motivation and difficulty focusing
  • Inability to enjoy activities that used to be enjoyable

These symptoms can seriously affect especially work and school performance. According to a study conducted by the Journal of Clinical Psychology, a decrease in work productivity was observed in 60% of individuals experiencing seasonal depression.

Important point: If these symptoms repeat in the same periods every year, this situation strengthens the possibility of seasonal depression.

Why Does Seasonal Depression Occur? Biological and Psychological Factors

The main cause of seasonal depression is the change in the chemical balance of the brain with the decrease in sunlight. Especially the decrease in serotonin levels and the increase in melatonin production cause the person to feel more depressive and prone to sleep. These biological changes directly affect the mood.

In addition, genetic predisposition is an important factor. The risk is higher in people with a family history of depression. Psychologically, stressful life events, loneliness, and low social support can trigger this situation.

Main causes of seasonal depression

  • Lack of sunlight and biological rhythm disorder
  • Serotonin drop and melatonin increase
  • Genetic predisposition
  • Social isolation
  • Intense stress and anxiety disorder

Research, according to National Institute of Mental Health (NIMH) data, has revealed that seasonal depression is seen approximately 4 times more in women than in men. This situation is also associated with hormonal differences.

How Does Seasonal Depression Pass? Effective Support and Management Methods

Seasonal depression is a treatable condition, and with early intervention, symptoms can be largely controlled. Light counseling, psychological counseling, and lifestyle changes play an important role in the support process.

Light counseling and psychological counseling methods

  • Exposure to natural daylight in the morning
  • Using special light counseling devices
  • Changing thought patterns with Cognitive Behavioral Therapy
  • Getting regular professional psychological support

Clinical research, according to American Psychological Association (APA) data, shows that light counseling can reduce seasonal depression symptoms by up to 70%. Light counseling applied especially in the morning hours gives more effective results.

Seasonal depression should be managed not only with medication but with a multifaceted approach. Conditions related to Depression and Anxiety should also be evaluated in this process.

Daily Routine and Lifestyle Suggestions in Seasonal Depression

Daily routine is very important in coping with seasonal depression. Regulating the biological rhythm of the brain helps relieve symptoms. Regular sleep, healthy nutrition, and physical activity play a critical role, in particular.

Suggestions that can be applied in daily life

  • Waking up and going to sleep at the same time every day
  • Taking a walk for at least 20-30 minutes during the day
  • Eating a diet rich in Omega-3 and protein
  • Not reducing social activities
  • Limiting screen time, especially at night

These habits are very beneficial not only for seasonal depression but also for general mental health. These routines provide a supportive effect, especially in individuals experiencing Stress.

What is the Difference Between Seasonal Depression and Major Depression?

Seasonal depression and major depression are frequently confused, but there are important differences between them. While seasonal depression occurs in certain periods, major depression can continue throughout the year. In addition, symptoms in seasonal depression usually intensify in winter months and decrease in summer months.

In major depression, the situation is more continuous and the support process can be longer. This distinction is of critical importance in terms of creating the right support plan.

Frequently Asked Questions (FAQ)

1- Is seasonal depression permanent?

No, seasonal depression is usually a periodic condition. It can be brought under control with appropriate support and lifestyle changes.

2- Who experiences seasonal depression the most?

Usually, women, young adults, and individuals living in northern regions are at higher risk.

3- Is medication required for seasonal depression?

Medication is not required in mild cases. However, in advanced cases, medication can be applied under the control of a psychiatrist.

4- How does seasonal depression pass quickly?

Light counseling, regular exercise, and psychological support can speed up the process. Going out into the sunlight, especially in the morning, is very effective.

Psychologist Ethem Tozbay

Psychologist Ethem Tozbay

Graduated from Mersin University, Ethem Tozbay specializes in Cognitive Behavioral Therapy (CBT), providing online psychological support for anxiety disorders, depression, and relationship problems. As an active member of the Turkish Psychological Association, he integrates evidence-based approaches with a deep empathetic understanding.

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