@lisalucier nice list of possibilities. However, it’s just a start. @dailypain as mentioned to @vklittle61 could also be nerve compression (not nerve damage) resulting from myofascial pain. In other words, it can be reversed. I mostly had sitting pain but had whole chains of trigger points up and down legs and I believe into my psoas muscle. Let me tell you, when you have tension where a nerve plexus is (lumbar plexus goes thru psoas) you get some other weird effects, too. I described how I got rid of mine (my pain and tension) by stretching and exercise in replies to @bkruppa in the pudendal nerve entrapment thread of this website. This does not show up on imaging. As the authors of “a headache in the pelvis” state, it’s something like 6 years average before a correct diagnosis is made. Meds like nortryptyline can help calm nerves but stretching and exercising and very deep inspiration and learning relaxation techniques can largely get rid of this. Please see my prior posts in the pudendal nerve entrapment thread for the details.