Harvard Health said: “You can have a heart attack and not even know it.
“A silent heart attack, known as a silent myocardial infarction (SMI), accounts for 45 percent of heart attacks and strikes men more than women.
“They are described as ‘silent’ because when they occur, their symptoms lack the intensity of a classic heart attack.”
Signs you could be having a silent heart attack include nausea, cold sweats or dizziness.
Dr Jorge Plutzky, director of the vascular disease prevention program at Harvard-affiliated Brigham and Women’s Hospital said: “SMI symptoms can feel so mild, and be so brief, they often get confused for regular discomfort or other less serious problems, and thus men ignore them.”