[Visceral pain in acute abdomen].

Visceral pain is caused by either distension or contraction of the visceral muscular wall or obstruction of hollow gastrointestinal organs. Unlike the somatic pain due to peritonitis, visceral pain is diffuse, epigastric, periumbilical and is often accompanied by nausea, vomiting and restlessness. We demonstrate the significance of visceral pain in the differential diagnosis of the acute abdomen presenting five cases of appendicitis and cholecystitis. A correct early diagnosis of the acute abdomen while signs of local peritonitis are still absent (appendicitis in atypical location, recurrent acute appendicitis, spontaneous reopening of an occlusion) is facilitated by the awareness for the characteristics and symptoms of visceral pain, and therefore careful taking of the patient's history. A history lacking visceral pain on the other hand represents an important clue for the diagnosis of other conditions (gynecological, diverticulititis, etc.) with acute pelvic peritonitis.