New research shows people who suffer from seasonal-affective disorder may be overlooked by their physician, even though "sad" is considered a subtype of major depression.
This time of year causes some people to feel extra gloomy.
However, researchers say some physicians may not spot symptoms.
The condition may also be masked by other illnesses like A.D.H.D. and alcoholism.
Exerts say there are various treatments for "sad," like light therapy, cognitive behavior therapy, and medication.
However it takes a thorough screening to diagnose the disorder in the first place.