Losing your temper can raise your risk of a heart attack or stroke within hours after your meltdown. A review and analysis of nine studies conducted between 1966 and 2013 found that within two hours of an angry outburst, the risk of a heart attack or acute coronary syndrome (which means heart attack or angina) increased nearly five-fold. The analysis also suggested the risk of stroke increased nearly four-fold, as did the risk of ventricular arrhythmia, a dangerous heart rhythm disorder. The researchers reported that the risk was highest among people who often lost their temper and also had existing risk factors for heart problems. While the individual risk of having a coronary event after an angry blowup is generally pretty low, the investigators wrote that among people who get angry more often, five outbursts a day would lead to approximately 158 extra heart attacks per 10,000 people per year among those at low risk, and 657 extra heart attacks among those at high risk.
Elizabeth Mostofsky et al, “Outbursts of anger as a trigger of acute cardiovascular events: a systematic review and meta-analysis,” European Heart Journal, DOI: 10.1093/eurheartj/ehu033, published online 3 March 2014