Dude just the tiniest bit of anxiety that butterfly feeling in my stomach causes me to stutter and usually it's a snowball effect. I was able to block out my stutter most my childhood by avoiding talking to people and skipping speeches i always blamed it on my bad teeth. But years later after getting my teeth fixed and opening up more I realised how often i tripped over my words, and the blocks where i can't say words that start with T,M,R,E when i started working was when i really noticed i had a stutter and i manifested it and let it control my life. Oh and btw i had a MRI done last year when i had a seizure at work and nothing came up