The aim of the study was to "refresh" the knowledge about the course of acute appendicitis, to confront the classical clinical picture with the practice, analyze its fluctuations and identify factors influencing these.Material and methods. All patients admitted to the Department of General Surgery in Grudziądz District Hospital with the suspicion of acute appendicitis, who underwent appendectomy and in whom the appendicitis was confirmed in pathologic examination were included in the study. There were 85 patients, 49 men (58%) and 36 women (42%) in a mean age of 30 years (range 10-75). Symptoms, signs and results of biochemical tests (leukocyte rate and CRP) were considered in the analysis.Results. The commonest constellation of symptoms and signs, occurring in at least of 3/4 patients consisted of pain and tenderness localized in right lower quadrant (100%), which exacerbates at movements (98%), felling unwell (93%), loss of appetite (88%), and rebound tenderness in right lower quadrant (74%).Conclusions. No particular fluctuation of clinical features in relation to gender, age, duration of symptoms, biochemical parameters and morphological severity of the inflammation was observed. Relevant findings included relatively fast development (<12 hrs) of advanced appendicitis in 18% of adult patients and more than a half patients with normal body temperature, regardless true appendicitis.