Well, at first it's a dull pain because the appendix' nerves aren't as efficient as some of your other organs.

  "We have a Code Appy down here. Get a message to the brain, quick!" said Officer Omentum.
  "Do you want to borrow one of my connections?" asked Small Intestines.
  "If the kid is in real pain, why didn't the appendix speak up in the first place?" questioned Peritoneum.

As bacteria starts to grow in the opening to the appendix, the pain moves over to your right hip area.