Pain in the upper abdomen. A stomach ache is a common symptom of abdominal ailments, and appendicitis is no exception. In this case, at the commencement of the condition, you’ll find the pain centered on the region of the navel. As the condition progresses, of course, the pain will spread to encompass the entire abdomen and increase in intensity exponentially as the condition worsens. It goes without saying that the condition is serious and potentially fatal.