Dr. Seuss’s romanticizing of the condition notwithstanding, if you really feel your heart grow three sizes, get to a cardiologist immediately. It’s called cardiomegaly, and it’s nothing to trifle with. What Seuss glossed over is that the Grinch dropped dead months later while carving the hotdogs at the Whoville's 4th of July bash. The Whos knew he'd been unwell -- he just hadn't looked very green lately.