Help? Weird pulsing sensation below right breast? I am 16 years old, female, healthy. For the past few days I have experienced what feels like a heart beat under my right breast, 4 or 5 inches below it. It is rapid and may go on for 30 to 45 minutes, then

You . You are likely experiencing tachycardia (fast heart rate) and likely feel your heart beating under your breast. There are many causes of tachycardia, the most common being anemia, dehydration, stress/anxiety. I recommend you have your parent/guardian take you to your doctor for an evaluation/work up of this problem. Best of luck.