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Dr Yassir Javaid A heart attack (myocardial infarction) is usually caused by a blood clot, which stops the blood flowing to a part of your heart muscle. You should call for an ambulance immediately if you develop severe chest pain. [https://patient.info/health/heart-attack-myocardial-infarction-leaflet](https://patient.info/health/heart-attack-myocardial-infarction-leaflet)