Had my navel pierced. It never healed. I was in chiro school, in clinic, wearing nice clothes with pantyhose and a clinic jacket...it never got rest from the clothes or bending over patients... When it was done I nearly fainted from the pain, thankfully the piercer poured a sugar packet in my mouth, brought me right back! I had to drive myself home...was living in South Carolina at the time, and piercing was (is still?) illegal there, had to go to Asheville NC for it. That was a LONG drive.
Had it for a few months, couldn't take it anymore. Took it out. I think it healed up inside 5 minutes.
Graduated, moved out to WA, had it done again. Gave it well over a year that time....never ever ever healed. Was always crusty and red and painful and nasty. NOT sexy. Took it out. Healed in about a week.
At some point I found that during the first piercing, they used these forcep things to pull the skin, and those things cut me! Which explains quite a bit of the pain. I have the most interesting scars! Two triangles from that tool, then 4 healed over holes.
The whole thing stretched out horribly while I was pregnant, very unattractive! And it still hurts sometimes, and I can feel sort of a tube of scar tissue in where the ring would have been. Ugh.
I have three normal piercings in my left year, one in my right, those were fine and dandy and healed and didn't hurt. I would NEVER have expected such problems with my belly button!