Hyperemesis Gravidarum – what is it exactly? At least 50% of women suffer from some nausea and vomiting, but in only a small proportion (less than 1%) does this become so severe that it leads to an inability to tolerate enough oral fluids to maintain hydration which can lead to dehydration and occasionally weight loss, imbalances in important electrolytes in the body (such as sodium and potassium) and poor nutrition.

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