 The summer blues is not just an expression, but it turns out it can be an actual medical condition. WTOP's Matt Koufax sat down with a local psychiatrist who says it's more common this time of the year than you think. We call that summer seasonal affective disorder, or summer SAD. Dr. Christina Lee with Kaiser Permanente says seasonal depression is more commonly thought of as a winter phenomenon, but 10% of people with seasonal depression issues are actually more affected in weather like this.