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Sometimes gastroenteritis simulates an attack of acute appendicitis.There is vomiting,abdominal pain and also fever.Here the history of loose motion is important and the sequence of pain abdomen,vomiting and fever lacks.There is no particular point of pain on pressure over the abdomen.Rather there is a diffuse pain all over the abdomen and an urge for defection called tensismus .Sometimes some type of appendicitis simulates gastroenteritis. But in appendicitis usually patient goes for defaection after each feed i.e. a sort of intestinal irritation.However is has to be differentiated carefully.The stool examination holds the key .An ultrasonogram may be helpful.