Nausea is a symptom of low blood pressure and may accompany long-term hypotension and fatigue. Nausea and vomiting or diarrhea together may result in hypotension due to loss of fluids. Severe nausea with other symptoms (and not due to a known cause such as pregnancy) requires immediate medical attention. Anyone experiencing vomiting or diarrhea should drink plenty of fluids to prevent dehydration.

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