[header] How to treat nstemi [title] Call emergency services for symptoms of a heart attack. [step] Signs of a heart attack include chest pain or discomfort; pain or numbness in the arms, neck, back, or jaw; shortness of breath; and dizziness. Symptoms can be subtle, but if you suspect you're having a heart attack, seeking immediate medical attention is essential. 
[substeps] Pain in the middle of your chest, or angina, may come and go. It may feel like squeezing or uncomfortable pressure.