Intense anger can be bad for a lot of things: your job performance, your driving record, your ability to keep a girlfriend, and in certain cases, your odds of persuading the parole board to let you out on good behavior.
But what angry outbursts are really bad for is your health—a fact just confirmed by a scary study at the University of Sydney, which found that, for as much as two hours after you blow your stack, your risk of a heart attack is nine times higher.
If you have anger issues, get treatment now. Learn deep breathing, and practice exiting volatile situations at the first sign of trouble. “Nine times higher” is nothing to fool around with.