Which of the following is NOT a symptom of foodborne illness?

High blood pressure is not considered a symptom of foodborne illness. Foodborne illnesses typically manifest through gastrointestinal symptoms that arise from consuming contaminated food or beverages. Common symptoms include nausea, diarrhea, and vomiting, which occur due to the body's response to pathogens or toxins present in the contaminated items. These symptoms are direct reactions to the infectious agents and their effects on the digestive system. High blood pressure, on the other hand, is a chronic condition related to cardiovascular health and does not result directly from foodborne pathogens or toxins.