I HAVE PAIN IN THE RIGHT BACK SHOULDER BLADE AREA

i HAVE PAIN IN THE RIGHT BACK SHOULDER BLADE AREA WHICH RADIATES DOWN MY RIGHT ARM..SEEMS LIKE A PINCHED NERVE OR MUSCLE..MY NECK DOESN'T HURT BUT FEELS ALITTLE TIGHT..CHEST DOESN'T HURT..THE PAIN IS A THROBBING PAIN GOES AWAY FOR AN INSTANT THEN COMES BACK HARD..PAIN MOVES UP AND DOWN MY ARM AND SHOULDER AREA...