How do you know if you're having a heart attack?

When: U have unbearable chest pain sweating or u don't feel good go to Er or call ambulance

Depends: Although chest pain or pressure are the most common sx. Other sx include pain, fullness or squeezing sensation of the chest; jaw pain, toothache, headache; Shortness of breath; Nausea, vomiting, upper middle abdominal discomfort,; sweating; heartburn or indigestio;, Arm pain L>R.; Upper back pain, Gerneral malaise; lightheadedness; or NO SYMPTOMS at all. Seek prompt medical attention for MI