When you think of the people who've made you mad, done you wrong, sent your blood boiling, do you get all flustered? Does your heart start racing? This is what happens to many folks when they recall a past slight against them, reports a Psychological Science study cited in May's Women's Health magazine.

Blood pressure and heart rates increase to nearly twice the normal rate when some people think about vengeful situations. Conjuring up thoughts of ill will can cause repeated periods of stress and can ultimately lead to cardiovascular damage. The good news is this: When people imagine forgiveness, their stats return to normal.

Next time you get all worked up about a past nemesis, be sure to call up some memories of making amends. If forgiveness is not part of the equation, try to recall what was true about the situation -- leave out all four-letter words -- and focus on wishing your one-time enemy well.