I feel like stuttering is a mix of psychological and physical factors. Especially if you consider something like the [The Monster Study](https://youtu.be/h5yPwWybgD4?si=c2WotPdZy-Ut1Mep) I went through a difficult time in my life and I was put on a mix of psych medications. A side effect of this was my stuttering went away by 85%. But I feel like when we are all nervous or anxious we stutter more. When we are relaxed or talking to someone a loved one we feel safe with we stutter a lot less.