Danish researchers studied more than 12,000 nurses between the ages of 45-and-64 over a period of 15 years.
The study showed nurses who described their stress as being a little too high were 25 percent more likely to have ischemic heart disease than those who called it manageable -- that's when the heart doesn't get enough blood and oxygen.
The heart disease risk increased by 50 percent for those who called their stress level much too high.
