Usually a heart murmur means that one of your valves is not functioning 100%. I also have a murmur and for the most part have had to do nothing about it my whole life. About 3 years ago I was told I should take premeds before having any operation or dental work which I do since bacteria released during these procedures could infect the valve. The type of murmur I have needs additional monitoring so I go to a Cardiologist and have an ECHO performed every year. In addition, I am taking an ACE inhibitor to lower blood pressure thus hopefully prolonging the life of my valve. However, from what I have been told, most murmurs are harmless. I would recommend getting an ECHO done to figure out which valve is leaking and consult a Cardiologist on if there is any need for concern. Good Luck and don't stress about it.