Depression is characterized by a persistent low mood that can affect quality of life. If symptoms usually only occur in the winter months, it may be seasonal affective disorder (SAD), or major ...

Depression and seasonal affective disorder (SAD) share similar symptoms, but depression can occur at any time of the year, while SAD follows a recurring seasonal pattern. For a SAD diagnosis, a person ...

Key points Seasonal affective disorder, or SAD, is a specific form of depression that can cause dark emotions such as guilt or worthlessness. A common form of seasonal affective disorder starts in ...