848 Views. Well, the classical view is that heart attack pain radiates more to the left than the right, in practical terms it really doesn't radiate to the left more than the right. How an individual perceives the pain really depends upon the person. Pain from a heart attack or from a partially blocked artery to the heart is thought to be the result of a lack of blood flow and thus a lack of oxygen to the muscle of the heart. It is not clear what substance causes the pain, but lactate, serotonin, and a number of other substances may be the culprits.