When you're feeling down about your life and yourself, do you wonder if you're depressed or just plain sad? Should you be worried about your mood shifting, or should you just ride it out? Sadness ...

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 ...

Although research has found a strong connection between vitamin D deficiency and depression, it’s unclear whether vitamin D supplements can improve the symptoms of seasonal affective disorder.