Seasonal Affective Disorder

What Is Seasonal Affective Disorder (SAD)?

Seasonal Affective Disorder (SAD) is a type of depression that occurs at specific times of the year, most commonly during the winter months. Often referred to as “winter depression” or “winter blues,” SAD is recognized by the American Psychiatric Association as a form of major depressive disorder with a seasonal pattern.

Symptoms of Seasonal Affective Disorder

The symptoms of SAD often mimic those of major depression. Common signs include:

• Persistent low mood or sadness

• Loss of interest in activities once enjoyed

• Oversleeping and difficulty waking

• Overeating, especially cravings for carbohydrates

• Weight gain or, in some cases, weight loss

• Feelings of worthlessness or hopelessness

• Difficulty concentrating

Symptoms typically begin in late fall and may continue through early winter, lifting as sunlight increases in the spring.

What Causes Seasonal Depression?

SAD is believed to be linked to reduced exposure to natural sunlight. Less sunlight can disrupt your internal clock (circadian rhythm), affect serotonin levels, and influence melatonin production — all of which play roles in mood regulation. Individuals living at higher latitudes, where winter days are shorter, may experience more severe symptoms.

Who Is at Risk for SAD?

Several factors increase the risk of developing seasonal depression:

• Family history of mood disorders

• Personal history of major depression or bipolar disorder

• Living far from the equator

• Having other mental health conditions

Diagnosis and the DSM-5 Criteria

Health care providers diagnose SAD based on a history of depressive episodes that follow a seasonal pattern for at least two consecutive years. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) classifies it as a specifier of major depressive disorder or bipolar disorder.

Effective Treatment Options for SAD

1. Light Therapy (Phototherapy)

Bright light therapy is often the first line of treatment. Using a light box that emits 10,000 lux of cool-white fluorescent light may help reset your internal clock and improve mood. Sessions typically last 20–45 minutes daily during the morning hours.

2. Cognitive Behavioral Therapy (CBT)

CBT tailored for SAD focuses on replacing negative thoughts and behaviors with more positive ones. CBT-SAD has been shown to have long-lasting effects compared to light therapy alone.

3. Antidepressant Medications

Selective serotonin reuptake inhibitors (SSRIs) such as fluoxetine or bupropion may be prescribed to help regulate serotonin levels. Discuss with your health care provider about potential side effects and the benefits of antidepressant medications.

4. Vitamin D Supplements

Some studies suggest that vitamin D supplementation may alleviate symptoms, particularly in those who are deficient. Talk to your health care provider before starting any supplements.

When to Seek Help

If you notice signs of depression returning each year during specific times of the year, it may be time to speak with a mental health provider. Early diagnosis and intervention can significantly improve your quality of life.

Support for Seasonal Affective Disorder in Baltimore

CBT Baltimore offers evidence-based psychotherapy for Seasonal Affective Disorder and other mood disorders. Our team specializes in cognitive behavioral therapy and works closely with clients to develop personalized treatment plans that support long-term wellness.

You Don’t Have to Face Winter Alone

If you or a loved one is struggling with symptoms of SAD, connect with a licensed therapist today. At CBT Baltimore, we’re here to help you navigate seasonal changes with confidence and care.

Reach out to schedule a consultation and take the first step toward feeling like yourself again.