“How can I tell if my chest pain is from running or from an issue with my heart?”

Hi, you need a cardiac workup based on your symptoms. You need a good history, physical exam, risk evaluation, ekg, labs, echo and a stress test. May consider starting asaprin , but a workup is in order.

If you are otherwise healthy and not a smoker ,and you have no family history of coronary artery disease at relatively a young age between 40-60 and you have been following a healthy lifestyle,then your chest pain at your age is less likely caused by coronary artery disease. However, the chest pain may still occur in less common heart conditions, such as certain types of cardiomyopathy and valvular heart disease. If the chest pain is very recent, then a typically benign inflammation could be a plausible cause. The inflammation may affect the layers which cover the heart or the lungs or even in the thoracic cage.
I recommend you consult with your physician if your symptoms persist.
An echocardiogram may sometimes be needed.

Thanks for your question. The pain you describe is concerning for "angina"-- pain caused by lack of blood flow to the heart. You need to be evaluated, preferably by a cardiologist. You will likely need some cardiac testing, either a stress test, a CT scan, or possibly an angiogram. You should do this ASAP. In the meantime, don't run so hard you provoke your pain, and if your pain comes on at rest, with less exertion, or doesn't go away... get to an emergency room.

You need a stress test and if there is chest pain and ecg changes with exercises, that may suggest you have coronary disease and further testing may be needed.

Stress test
Echocardiogram