I did NOT start HRT to treat my stuttering and I do not advise people to do so. To answer your questions: HRT has helped me become calmer because testosterone causes aggression. I don’t believe that I think differently or pronounce words in a different way. I am positive that I see a difference in my breathing pattern which of course could be related to the nervous system. Before HRT, I used to feel as if I was carrying a heavy weight on my chest that made breathing more difficult. It was more intense when I blocked on a word. This rarely happens any more.