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Is it possible to develop a heart murmur over time, and if so, what can cause that to happen?

. said:
36. Of all the checks I 'the VE has had in my life, every time a doctor has a stethescope my case, only this time their last one told me that I have a heart murmur. Makes me wonder. Apparently, the one or the other I didn 't have one before, or [...]