How would you know if your child has the stomach flu or appendicitis?

Sxs: Appendicitis pain can start with mild pain around the belly button. The pain worsens over time. It can become sharp with loss of appetite, nausea, vomiting & possibly a fever. The pain usually moves toward the right lower quadrant of abdomen. Bouncing or jolting will often make the pain worse. Appendicitis can have varying presentations. Go to er for severe abdominal pain.