For me it started when I was management in customer service. It first started when I would get a dry mouth from talking so much that I just couldn't speak because of it. For me I know its psychological and not neurological because of a few reasons. I'm not talking on behalf of anyone else regarding the reasoning of stuttering or psychological or neurological. When I'm speaking a sentence, I get a feeling that I'm going to stutter on a future word and that makes me stutter on that word. I went to a speech therapist, and they had never heard of that. I passed the speech therapist's test with flying colors, and she said I didn't have a stutter. Adding on to the "future stutter prediction thing" from earlier, this creates an anxiety in situations which make me stutter more. When I was management for my previous job, I got into the habit of always stuttering my phone introduction which made me terrified of answering phones. I would get made fun of by customers because they didn't know I was stuttering. I'm very confident in my public speaking and when I am controlling a crowd, I don't stutter at all. Being knowledgeable about what I am speaking about and confidence in that helps. I know I stutter well when I don't have enough breath and bravado in my voice. I've tried isolating this to control my stutter but haven't been successful. My jobs for the last 1.5 years have had almost no stress and little people interaction, so I know that has helped reduced my stutter because, for me, it is derived from stress and anxiety.