Chest pain is not a symptom you should ever ignore, for obvious reasons. Chest pain, as almost anyone knows, may indicate a cardiac problem. For this reason alone, if you have chest pain you should be evaluated by a doctor.
Definition of cardiac muscle. : the principal involuntary-muscle tissue of the vertebrate heart made up of striated fibers joined at usually branched ends and functioning in synchronized rhythmic contraction.
Cardiac muscle is a  striated involuntary muscle tissue.   Cardiac muscle, which is involuntary striated muscle.   Cardiac muscle is found.   Cardiac Muscle is found in the heart.   Cardiac muscle   That would be cardiac, its only found in your heart.