There's a lot of factors that go into it all. We don't know enough about it. https://en.wikipedia.org/wiki/Stuttering#Causes https://en.wikipedia.org/wiki/Stuttering#Classification Also, I daresay it's not necessarily in your interest to pursue knowledge about your specific cause. The approach remains the same, regardless: Figure out how to manage it. So, instead of facing backwards, you ought to be facing forwards, as it were.