I had chronic neuroinflammation, including up around C1 (the part of the neck that joins the skull) for years, I also stuttered, for years. I fell, damaged up by C1 - spinal cord lesion up there, very small. Years of neuroinflammation, movement disordered, severe speech disorder (stutter, dysarthia) and this went on for ... 4 years. I worked at it through speech therapy, and then hey! Success, one day I woke up and no longer had any true dysfluency. Admittedly, I thought it was weird it happened over night, and then next day woke up- couldn't move. The neuroinflammation had caused damaged to my spine at C5/6, making me an imcomplete quadriplegic. Meds administered, inflammation down, and speech issues have not returned. When talking with my neuro, he believed that my C1 lesion was irritated by the inflammation, and the secondary lesion changed that, administration of drugs took away the inflammation. He thinks my speech issues were solely caused by this chronic neuroinflammation and irritation of the C1 lesion. HOWEVER - I still have some stuttering, not a lot, but a little and some odd speech individualisms. This is entirely psychological. So, stuttering/speech disorder can be physical. It doesn't even have to be specifically the 'speech region' of the brain, but it can also be psychological. A person who was in a car crash and had some sort of brain damage that wrecked their memory (usually that'd be severe, but for the hypothetical let's assumeno) might not stutter, lacking the previous associations they had with speech. But,it depends on what causes their specific stutter. We don't know what really causes stuttering/dysfluency - some cases might be purely psychological, some might be purely neurological but we don't know and until the cause is known can't really hypothesise on whether or not its This Thing or That Thing without evidence. It is my understanding that of current no structural differences have been found neurologically, though there has been at least [one case where a man acquired a head injury and ceased stuttering.](https://n.neurology.org/content/36/8/1109) At the moment though, it seems each disorder must be individually addressed and we should really be focusing our energies on acceptance and accessibility for dysfluent folks? Tl:DR - cure for my movement/speech disorder was tamping down neuroinflammation and gaining paralysis. However, I do still have a psychogenic stutter. We don't really know what causes stuttering, and until we do there should be more chat on access and acceptance.