I have piriformis problems. Went to the doctor to get an MRI on the area, and they found degenerative conditions in the lower back that was fouling up the nerves in my back. Doc told me the pain in the piriformis was actual problems with my back and the nerves that connect it to the piriformis. Chiropractor seems to help on this one quite a bit. Also do some stretches. If you google "piriformis stretches" you will find a lot of good stretching routines...