So if everything is normal from a neurological and genetic point of view, it could be purely psychological (but I strongly doubt it), or due to dyspraxia, autism or other neurodivergence (but then I imagine that it should have appeared on the test) after if we haven't seen anything, it could also be due to the fact that the stuttering doesn't appear clearly on an x-ray or an MRI (if this is the test you did) , as it's full of subtle differences a bit everywhere that cause it. I also recommend a speech therapist, who will be able to help you know exactly what fluency disorder you have (and therefore the causes). For some types of stuttering, yes it can go away, for others, techniques or therapies can help make it practically imperceptible, but if the stuttering of the "childhood onset fluency disorder" type is not treated as early as possible in childhood, it will remain for life (and it is not a problem as long as one lives well with it). For the blockages, unfortunately, I can't help much beyond what I've already said above, and I know it's complicated (even for me lately because I often throw under pressure), but I really think that the techniques help. But hey, I'm still just a stutterer who liked to do research, and I was lucky enough to have an SLP, so I'm not an expert on the subject either and I may be wrong (I did check two or three pieces of information to be sure before writing). So if anyone wants to correct me or contribute something I highly encourage it.