“While the absolute risk of any one anger episode triggering a heart attack is low, our data demonstrates that the danger is real and still there,” said Dr. Thomas Buckley, a senior lecturer and researcher from the University of Sydney and Royal North Shore Hospital in Australia. The increased risk of heart attack after intense anger or anxiety is “most likely the result of increased heart rate and blood pressure, tightening of blood vessels and increased clotting, all associated with triggering of heart attacks,” Buckley said.