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Most of us will know that nausea and vomiting are common in pregnancy, affecting up to 70% of pregnant women. Less well known is hyperemesis gravidarum, or HG, in which nausea and vomiting reach a severity such that women struggle to eat or drink, often losing weight or becoming dehydrated, sometimes to the extent that they require intravenous fluids. As a neuropsychiatric doctor and researcher at King’s College London, I have a particular interest in the overlap of physical