As fortis said, there are different types and different degrees of murmurs. Quite a lot of them. To learn the implications for anyone of any age, it is necessary to get back to the doc who diagnosed the murmur and ask him/her for much more information.
A murmur is the sound that blood makes when it flows through the valves and chambers of the heart. This sound can be due to several reasons, including increased blood flow and valvular disease. In a young person with no heart conditions, this flow could be completely normal and just reflects the sound of blood flowing through the heart. Your physician can tell you more about what your murmur is due to.
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