Two years ago I had a small vibration in my lower right pelvic region. Was very minor, just kind of weird and I ignored it. I happened to go in for a colonoscopy because I'm in my 50's and it was just time to do that... thank god, too. Right about where that vibration was they took out a large, precancerous polyp and I haven't felt any vibration since. Well, in that area. Now it's back on the lower left side and scaring me a lot.. it's more noticeable and pretty much constant. I'm lucky my doctor isn't ignoring my concerns (if he were, I'd switch to one who wouldn't). He suggested an ultrasound of the ovaries first, and if nothing there then another colonoscopy. Not sure any of this relates to anyone else's situation, but you might not want to ignore that vibration...