If You Feel Chest Pains...

Advice to my friends:
If it is on or near Christmas Day (or Boxing Day or New Year's Day), and you feel sufficiently ill that you would go to the hospital any other time but you won't go on Christmas Day because you don't want to disturb a physican who might be on call, or because you don't want to break up a family get-together, or whatever, go to the hospital anyway!

From cnn.com:

More Americans die from heart attacks and other natural causes on Christmas, the day after and on New Year's Day than on any other days of the year, the researchers reported.
It is probably because people are feeling too busy or too festive to go to the hospital over the winter holiday season, the researchers wrote in Monday's issue of the journal Circulation.

Also see here for other coverage of the study. The graphic accompanying the article in this latter link makes it clear that December and January are high-risk periods, but those three days really stand out!