Like Mr. Grinch, heartburn can crush your holiday, but there are easy ways to prevent it.

"Heartburn is caused by acidic stomach content moving into the esophagus, or gullet, which is much less resistant to acid," said Dr. James East, a gastroenterologist at Mayo Clinic Healthcare in London. "This results in irritation and damage to the lining of the esophagus, literally a burn, that caus...