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 ...

Man in front of a light therapy box, which mimics the sun and treats people suffering from seasonal affective disorder. You don't need a clinical definition to know something's off when the mere ...

Add Yahoo as a preferred source to see more of our stories on Google. Dr. Norman Rosenthal, the author of Defeating SAD: A Guide to Health and Happiness Through All Seasons. (Photo illustration: Yahoo ...