Generally speaking, myocardial infarction will have an early symptom, that is, a period of time before the occurrence of myocardial infarction, usually a week or two or three days ago, there will be symptoms of angina pectoris. One of the symptoms is that I have never had a problem before and my activities are normal. During this time, when I was walking fast, jogging or going up the stairs of three or four floors, I suddenly felt uncomfortable in my chest, or my teeth and jaws were sore, or my abdomen was uncomfortable. Once I stop, I'll see a doctor as soon as possible in this case.

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