From August 1992 to August 1993, 45 female patients with acute appendicitis and 48 patients with pelvic inflammatory disease, all between the ages of 15 and 45, were included for comparative study at the onset of symptoms between each phase od the menstrual cycle. There was no significant difference of onset of symptome between acute appendicitis and pelvic inflammatory disease in each phase of the menstrual cycle. Menstrual history was not a good indicator for differentiating the two conditions. To make a more precise differential diagnoses, more information, to include detailed history, physical examinations and laboratory findings, is necessary.#0771
