Yes. We did find the cause and my problem is almost completely resolved by physiotherapy exercises. It took a few weeks to sort itself out and if I am not careful it starts coming back but it's mostly gone.
Long version in case this helps someone: I have hypermobile-type Ehlers-Danloss syndrome, which is a disorder affecting the body's connective tissue. Among other things it means I'm more bendy than I should be. As a consequence I have to be careful not to make too extreme movements because I can injure my joints. In this case, the problem was because I wasn't utilizing my full range of movement, my nerves were essentially getting stuck in various places where they travel through small gaps or over tendons or whatnot. The solution is to do (gentle) stretching-type exercises which are designed to make the tendons do their full range of movement (I have to do this carefully so as not to hyperextend and injure myself), which causes the nerve to be pulled through these gaps and unstick itself. Because this process is like floss being drawn through a gap between teeth, the exercises are actually called "flossing" by physios
Here's an example specifically in the domain of sciatica, although that's not what I do[1]
Long version in case this helps someone: I have hypermobile-type Ehlers-Danloss syndrome, which is a disorder affecting the body's connective tissue. Among other things it means I'm more bendy than I should be. As a consequence I have to be careful not to make too extreme movements because I can injure my joints. In this case, the problem was because I wasn't utilizing my full range of movement, my nerves were essentially getting stuck in various places where they travel through small gaps or over tendons or whatnot. The solution is to do (gentle) stretching-type exercises which are designed to make the tendons do their full range of movement (I have to do this carefully so as not to hyperextend and injure myself), which causes the nerve to be pulled through these gaps and unstick itself. Because this process is like floss being drawn through a gap between teeth, the exercises are actually called "flossing" by physios
Here's an example specifically in the domain of sciatica, although that's not what I do[1]
[1] https://www.medicalnewstoday.com/articles/nerve-flossing#exe...