Narrowing of the heart arteries is generally classified according to the number of vessels affected (there are only three). When all three vessels are narrowed or very specific disease affecting two vessels, treatment (such as a bypass surgery or stent) is almost always necessary. For less severe forms of two vessel involvement or disease of only one vessel, the need for relief of chest discomfort or trouble breathing determines the need for these types of treatments. Regardless, everyone with narrowing needs medical attention and specific medications to protect them. Medications are obtained upon recommendation from your doctor.