Everyone is different and those who have not experienced the pain from standing in relation to PN have no Idea what you are talking about thanks goodness for them really. Anyway I have no idea why but my theory is that there is some kind of connection with blood flow. If the blood is not flowing and if it’s causing pressure, (at least it feels like pressure building) my PN is much, much worse. If I stay on an exercise regimen where I get the maximum blood flow over time it PN seems to improve.