Which of the following symptoms is NOT associated with gastroenteritis?

Gastroenteritis is primarily characterized by inflammation of the stomach and intestines, leading to several key symptoms. Among these symptoms, nausea, vomiting, and diarrhea are commonly associated with this condition as they are direct results of the gastrointestinal disturbance. Nausea often precedes vomiting, while diarrhea is a frequent outcome of the upset in the intestines.

Dizziness can occur during gastroenteritis primarily due to dehydration or electrolyte imbalance resulting from the loss of fluids through vomiting and diarrhea. However, it is not a direct symptom of gastroenteritis itself. Therefore, while dizziness may accompany gastroenteritis as a secondary effect, it is not one of the hallmark symptoms typically identified with the condition. This makes it the correct choice for the symptom that is NOT directly associated with gastroenteritis.