Beware any pain killers with the active ingredient ibuprofen.
They all (Vioxx, Celebrex, Advil, Motrin) give me hives. While Mayo Clinic.org lists hives as a “rare” side effect of taking ibuprofen, you may be among those who suffer hives from taking this painkiller. It’s worth a try to take Tylenol instead for a while to see if your hives go away.
You might also suspect any other drugs you take regularly. Read carefully the paper inserts that come with any Rx you take, and read the ingredient lists of OTC meds.