Symptoms of a mild heart attack are mainly characterized by more severe angina, such as chest pain or discomfort in the anterior region of the heart. Myocardial infarction is caused mainly by plaque deposited on the walls of the arteries rupturing, forming a blood clot that blocks the coronary arteries and interrupts the flow of blood to the heart. The patient’s chest pain may be diffuse, making it difficult to pinpoint the exact location of the pain, and it is not aggravated by pressing on the chest or taking deep breaths. The pain usually starts mildly and then increases and peaks within a few minutes and may be recurrent, which may also indicate a serious condition such as aortic coarctation. In some cases, the pain may be limited to upper abdominal pain or a rapid or irregular heartbeat, nausea, or fatigue. Acute myocardial infarction may be triggered by overwork, overeating, strenuous exercise, sudden change of weather, and violent mood swings. Chest pain patients are advised to go to regular hospitals in time to avoid delay in diagnosis and treatment.