I received a message from a piercee who couldn't figure out why her old, established piercings were acting up:
I have several piercings all different ages some for as many as 10 years or more and not had any problems. Recently they have all began to migrate and reject and I don't understand why. Can you tell me why this would happen all of the sudden and at such volume after years of no problems at all?
Are you experiencing some kind of excessive stress right now? That can cause problems with healed piercings. If not, I'd suggest a visit to a doctor for a thorough check up. After a long history of stability, if your piercings are acting up that could indicate a health problem of some sort. Here is some information on how stress can affect you.
Please keep me posted!
She did just that, and contacted me again about three months later:
I emailed you a while ago regarding my migrating piercings. After some observation and doctor visits it was in fact due to high stress levels as you suspected.