Piercing sites. Each person has a different tolerance level for pain. The pain caused by a piercing depends on body location. Belly button piercings can be the gift that keeps giving (pain) because clothing often rubs against it. If it gets snagged and pulled out that will really hurt. The tongue can be quite painful.
Tongue piercing. I am answering this one a little "tongue in cheek" I have seen numerous people with "tongue ring's in my office. Many have had broken and chipped teeth due to the ball end of the ring. In addition one patient developed a carcinoma in situ (cis) on the roof of her mouth from constantly rubbing it (after removal of device lesion disappeared w/o surgery) gum tissue damage also can occur.