Myocardial infarction (MI), also known as heart disease, occurs when blood pressure drops or stops in the heart component, causing damage to the heart muscle. The most common symptom is chest pain or discomfort that can affect the shoulder, arm, back, neck or jaw. It usually occurs in the center or left side of the chest and lasts for more than a few minutes. Sometimes this discomfort can feel like a terrible burn. Other symptoms may include shortness of breath, nausea, feeling faint, cold sweating or feeling tired. About 30% of people have symptoms used. Women tend to be present without chest pain and instead have neck pain, arm pain or feel tired. Of those over 75 years of age, about 5% have ever had MI with little or no history of symptoms. MI can cause heart failure, abnormal heartbeat, heart attacks or cardiac arrest.