What are the first warnings or symptoms of appendicitis?

Pain, anorexia. Classic appendicitis symptoms are: pain that starts near the belly button and is crampy, and then moves to the right lower abdomen and becomes constant; and anorexia (not being hungry). Fever is common, and many have nausea. Most don't have vomiting or change in bowel habits. Symptoms can be atypical if the appendix is located somewhere other than the normal place (in the right lower abdomen).
Abdominal pain. Appendicitis usually initially presents as pain @ the umbilicus and then localizes to the rt lower abd sometimes with loss of appetite and a low grade fever and difficulty walking upright favoring the rt side of the abdomen.