I am not a neurologist, at least not yet. Nevertheless, I can only assume that it can also be caused by a sudden, emotional response such as fear. I remember a friend in school who started to stutter right after a bad experience. Stuttering can also be caused by other issues such as a human genetic background, or other emotional issues. What can I say? Life is so fragile and unpredictable. Anything is possible because the human experience is very mysterious and cannot be easily unraveled. We must always try to do our best with whatever life throws at us. That’s the only way we can truly be happy. Right?