When blood pressure increases, the heart pumps out less blood which means less blood is reaching the organs. As a result, extra pressure is placed on the heart. A lack of oxygenated blood to the brain causes digestive uneasiness and nausea. As a single symptom, nausea does not suggest hypertension. However, nausea associated with blurred vision and severe headaches may be a sign of malignant hypertension.

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