Thank you for your response. The thing is that the echo was done before I had the murmur and it came back perfectly normal. As far as I understand, he thinks my murmur is innocent based on an echo that was done 7 months ago, long before the murmur started. He also said that the murmur sounded like an innocent/functional murmur or something.
Hi. I am not a doctor and have little direct knowledge of this. If you have a heart murmur, though, I would think that there is some physical cause for it that your doctor would have some knowledge about after having seen your echo. I don't think there are a lot of mysteries here, at least not normally. Once they see your echo, and do a little testing they know. You should ask your doc why he thinks its innocent???