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What Causes Seasonal Affective Disorder?

February 9, 2025

A woman sits in bed, appearing depressed.

As winter lingers in Chattanooga and the excitement of the holiday season fades, many families turn to local attractions like the Tennessee Aquarium to make the most of the remaining colder months. However, for some, this time of year brings more than just chilly temperatures; it also comes with persistent sadness, low energy, and difficulty staying motivated. If you find yourself feeling down every winter, you may be experiencing Seasonal Affective Disorder (SAD).

SAD is a type of depression that follows a seasonal pattern, most commonly occurring in the fall and winter months when sunlight is limited. Understanding what causes SAD and how to manage its symptoms is crucial for maintaining your well-being during the colder months.

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What Causes Seasonal Affective Disorder?

While the exact cause of SAD isn’t fully understood, researchers believe it stems from a combination of environmental and biological factors. These include:

1. Reduced Sunlight Exposure

One of the most significant factors contributing to SAD is the lack of sunlight during the fall and winter months. Sunlight plays a vital role in regulating the body’s internal clock, or circadian rhythm, which influences sleep, mood, and energy levels. Shorter days and longer nights can disrupt this rhythm, leading to symptoms of depression.

2. Serotonin Imbalances

Serotonin is a neurotransmitter that helps regulate mood and emotions. Sunlight exposure is known to boost serotonin levels, so when daylight decreases in the winter, serotonin production can drop. Lower serotonin levels are linked to feelings of sadness, fatigue, and irritability, which are ommon symptoms of SAD.

3. Increased Melatonin Production

Melatonin is a hormone that helps regulate sleep-wake cycles. With reduced daylight hours, the body produces more melatonin, leading to increased feelings of drowsiness and fatigue. This can make it harder to stay alert and engaged throughout the day.

4. Vitamin D Deficiency

Sunlight is a natural source of vitamin D, which plays a role in mood regulation. During the winter months, many people experience lower vitamin D levels due to reduced sun exposure, potentially contributing to depressive symptoms.

Recognizing the Symptoms of SAD

SAD symptoms are similar to those of major depression but follow a seasonal pattern. If you suspect you have SAD, watch for the following:

  • Persistent sadness – Feeling down or hopeless most of the time.
  • Loss of interest – Losing enjoyment in activities you once loved.
  • Fatigue – Constant exhaustion, even after adequate sleep.
  • Sleep disturbances – Oversleeping or struggling to get out of bed.
  • Increased appetite – Craving carbohydrates or experiencing weight gain.
  • Difficulty concentrating – Trouble focusing at work or school.
  • Social withdrawal – Avoiding social interactions.
  • Feelings of worthlessness – Increased self-doubt or hopelessness.

Some individuals experience a less common form of SAD in the spring and summer, characterized by insomnia, irritability, restlessness, and weight loss.

How Can You Manage and Treat SAD?

If you suspect you have SAD, the good news is that several effective treatment options are available:

1. Light Therapy

Light therapy, or phototherapy, is one of the most common treatments for SAD. It involves sitting in front of a special light box that mimics natural sunlight for 20–30 minutes daily. This exposure helps regulate serotonin levels and reset your internal clock.

2. Cognitive Behavioral Therapy (CBT)

CBT is a form of talk therapy that helps individuals manage negative thoughts and develop healthy coping strategies. Studies show that CBT can be highly effective for treating SAD by addressing thought patterns that contribute to seasonal depression.

3. Medication

For those with severe symptoms, doctors may prescribe antidepressants such as Selective Serotonin Reuptake Inhibitors (SSRIs). These medications help regulate serotonin levels and improve mood during the winter months.

4. Lifestyle Changes

Simple lifestyle adjustments can also help manage SAD symptoms:

  • Spend time outdoors – Even on cloudy days, getting outside for a walk can provide some exposure to natural light.
  • Exercise regularly – Physical activity releases endorphins, which boost mood and energy levels.
  • Maintain a healthy diet – Eating nutrient-rich foods can help regulate mood and energy levels.
  • Stick to a sleep schedule – Maintaining a consistent sleep-wake cycle supports mental health.

When Should You Visit AFC Northshore?

If SAD symptoms are interfering with your daily life, it’s essential to seek professional help. At our clinic, our medical providers can evaluate your symptoms, rule out other potential health conditions, and recommend appropriate treatment options.

Visit us if you need:

  • An initial health screening – To assess whether your symptoms indicate SAD or another condition.
  • Guidance on treatment options – Including recommendations for light therapy, therapy referrals, or medication.
  • General wellness support – To address other winter-related health concerns.

Take Control of Your Mental Health This Winter

Late winter in Chattanooga still offers plenty of opportunities for enjoyment, from scenic hikes to family outings at the Tennessee Aquarium. Don’t let Seasonal Affective Disorder hold you back from making the most of the season. If you think you may have SAD, seeking support early and exploring treatment options can make a significant difference.

AFC Northshore is here to help. Our team provides compassionate care to help you manage your symptoms and regain your energy. Visit us today to take the first step toward feeling better and embracing the final months of winter with renewed well-being.

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