I just downloaded this from the mayo clinic website hope it helps. mj
How would you know if it's your heart?
It can be difficult or even impossible to tell what's causing chest pain. Be on the lookout for these heart-related warning signs:
Sudden pressure, tightening, squeezing or crushing pain in the center of the chest that lasts more than a few minutes
Pain spreading to the back, neck, jaw, shoulders or arms — especially the left arm
Chest discomfort accompanied by shortness of breath, sweating, dizziness or nausea
Pressure or tightness in the chest during physical activity or when you're under emotional stress
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Chest pain
When should you get medical help?
Occasional bouts of heartburn are common. If you have persistent heartburn or take antacids daily, consult your doctor. Your heartburn may be a symptom of GERD.
If the heartburn seems worse or different from normal — especially if it occurs during physical activity or is accompanied by shortness of breath, sweating, dizziness, nausea or pain radiating into your shoulder and arm — get emergency help immediately. These signs and symptoms may indicate a heart attack. In addition, seek medical attention immediately if you experience new chest discomfort and you have had a heart attack before, have heart disease or diabetes, smoke, are overweight or have high cholesterol. Proper diagnosis and prompt treatment may save your life.