I think maybe it has different causes for different people. I was told growing up that I stutter because my brain goes faster than my mouth can keep up. So I have to focus on slowing everything down. When I’m able to do that successfully my fluency is very good. Then you have other stuff out there like the barbaric [Monster Study](https://youtu.be/kJHJsXJZDLo?si=cEhY7EHUCtOjlue4)