Vol. 14 No 3 | Spring 2012
Nausea and vomiting of pregnancy (NVP) ranges from the occasional wave of nausea while trying to cook, to severe hyperemesis gravidarum. It affects up to 70 per cent of all pregnancies and persists beyond 20 weeks in 13 per cent. True hyperemesis gravidarum, characterised by severe vomiting, dehydration, significant weight loss and electrolyte disturbance, is relatively rare (0.3–3 per cent).