I had this from age 22-26, and I never really had a problem before or after that. There was no concussion or stroke involved, but it was a season of severe, debilitating and somewhat self-inflicted anxiety in my life. My fear and self-doubt was the cause, and then the result of my speech problems. When I finally learned how to fix my thinking (which took a long time to figure out, but was actually quite simple after I found a coach who helped me a lot), I stopped spiraling into despair and my speech problems cleared up almost overnight. It was honestly a terrible season of my life because my speech block robbed me of so much joy and confidence. When I saw through the illusion of self doubt, it was kind of like seeing how a magic trick is done. I couldn’t be fooled again.