Yes and no. At 29 I was diagnosed with a heart murmur
and a little leaking heart valve. I had regular check ups every year and echocardiograms to ensure the leak was not getting worse. Finally at 37 my leak became bigger, my ejection fraction
dropped (on my echo), began having severe symptoms of fatigure, heart palpitations, weakness, dizziness
, swelling in ankles, feet, and abdomen etc. I had to have my mitral valve replaced with a mechanical valve in 2003.
My advice to you is, keep a close check on this with your physicians. If your doctor is not a cardiologist, insist on a seeing a cardiologist not just a regular family physician.
Again not to scare you, most murmurs
are innocent and some people have small leaks for many, many years and they never have to have anything done about it, but some people do as with me (because my leak got bigger).
Again see a cardiologist if you are not already seeing one. If your cardiologist was the one that told you this, get a second opinion
if you are not comfortable and get yearly echocardiograms and exams just to be on the safe side.