Seasonal Affective Disorder: Signs and How Treatment Works

Per the NIMH, SAD is a type of depression characterized by a recurrent seasonal pattern, with symptoms that typically last about four to five months of the year. The winter pattern is the most common and involves symptoms that begin in late fall or early winter and lift in spring or summer.

A less common summer pattern involves symptoms that start in late spring or early summer. SAD is not a separate diagnosis so much as a seasonal pattern of depression, which is why a careful evaluation matters before treatment planning.

Winter-pattern SAD commonly includes low energy and fatigue, oversleeping, overeating with cravings for carbohydrates, weight gain, and a tendency to withdraw socially. It also includes the general signs of depression: a persistent sad or empty mood, loss of interest in activities, difficulty concentrating, feelings of hopelessness, and, in some people, thoughts of death or suicide.

The NIMH emphasizes that SAD is more than feeling low on gray days: the symptoms meet criteria for a depressive episode and meaningfully affect work, school, or relationships. If there are any thoughts of self-harm, call or text 988, call 911, or go to the nearest emergency department.

The winter blues describes a mild, temporary low mood that many people feel during shorter, darker days. It does not typically meet the criteria for depression and does not significantly disrupt everyday functioning.

SAD, by contrast, is a clinical depression with a seasonal pattern: the symptoms are more severe, persist for weeks to months, return around the same time each year, and interfere with life. Because the line can be hard to draw on your own, an evaluation is the reliable way to tell the difference.

The NIMH lists four treatment categories for SAD that may be used alone or in combination: light therapy, psychotherapy, antidepressant medication, and vitamin D. Light therapy involves sitting near a specially designed bright light box, typically for a short session each morning, and is best done with clinician guidance about timing and distance.

Psychotherapy such as cognitive behavioral therapy (CBT) and antidepressant medication treat the depressive episode itself. The extended-release form of bupropion is FDA-approved to prevent seasonal major depressive episodes in people with a history of SAD, and other antidepressants are commonly used. Vitamin D appears most relevant for people who are actually deficient, so it is worth discussing rather than self-treating.

Yes. SAD is tied to reduced daylight in the winter months rather than to cold weather or latitude alone, so shorter days in Central Texas can still affect mood, especially for people who work indoors, travel little daylight, or have a personal or family history of depression.

If you notice a consistent winter pattern of low energy, oversleeping, or low mood in Austin and the surrounding area, it is worth discussing. Care at Mynd Works is available in person and by telehealth across Texas, and the evaluation is the same regardless of where you are seen.

Seek an evaluation when a seasonal pattern of low mood or low energy persists for weeks, returns year after year, or interferes with your functioning. The goal of an evaluation is clarity: is this a seasonal pattern of depression, another condition, or something else, and what treatment approach fits your situation.

You can learn more about depression care at Mynd Works or request a consultation to discuss your concerns directly with the practice.