<human>: I'm a Caucasian male, 27 years old, 5'11, about 175 lbs. No family history of heart problems.

I went to a walk in clinic a few weeks back to see if I had a sinus infection or just a bad could.  It wound up being a cold but the Doctor noticed a heart murmur. At 27 years old this was the first time I was told about it. He said it could be irritated by the virus and all the caffeine I had that day. I went to my family doctor the next week. He said he couldn't really hear any thing, EKG came out fine, but wanted me to get a chest x-ray and echo-cardiogram to be safe.

Today his office called with the results from that.  Tricuspid valve has a small leak causing the murmur.  They called in some antibiotics and said to take them if I'm having any dental work done and get checked out again in about a year.  I asked if there were any life style changes and they said "No, it's not really anything to worry about, just want to take precautions with the antibiotics and monitor it."  

I didn't think of it in time and feel awkward calling the office again, but what could of caused this?  The little bit I found online says high blood pressure (which he didn't mention me having so I'm assuming it's fine) or born with it (wouldn't I have found out sooner?)

Also can anything help with this? any type of vitamins? Getting into cardio exercise?

Give me a shortened version of the text
<bot>: What could cause a tricuspid valve related heart murmur at 27 years old with no sign of hypertension, and is there anything I can do to help it?