Throughout today I have experienced a pulsating sensation in the right side of my chest (upper pec, near armpit). It is not painful; perhaps best described as a bit uncomfortable. I have a Cardiologist that I visit regularly and recently had a stress test, MRi, calcium test, heart and carotid sonograms. All tests results were good. I do take simvastatin for cholesterol lowering purposes. Should I seek help, or is this pulsating explainable? Thanks.