Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Heart Murmur ?
    ### Response:
    People who have innocent (harmless) heart murmurs don't have any signs or symptoms other than the murmur itself. This is because innocent heart murmurs aren't caused by heart problems.
                
People who have abnormal heart murmurs may have signs or symptoms of the heart problems causing the murmurs.
    