How to tell if these are symptoms common for appendicitis?

If worried, see doc: The classic symptoms of appendicitis are abdominal pain localizing to the right lower quadrant (RLQ) of the abdomen, some nausea and vomiting, and lack of appetite. On exam, there is RLQ tenderness. If the appendix has ruptured, pain and tenderness may be throughout the abdomen. Labs generally show elevated white blood count. Abdominal ultrasound or CT scan are increasingly used for Dx.