What is the very first symptom of appendicitis?

"stomach ache": Appendicitis usually begins with ill-defined abdominal pains not unlike a "normal" stomach ache, often associated with nausea and a poor appetite. Typically within 24 hrs, the pain appears to change, becoming sharp, constant, and well-localized to the right lower abdomen.

Abdominal pain: May be mild, increase, move to right lower abdomen and focus and intensify loss of appetite, nausea and occ vomiting may also be early and confuse with gastroenteritis.