Nausea and vomiting of pregnancy is a common condition with prevalence rates for nausea of 50–80% and for vomiting and retching of 50% (5). An estimated 50% of pregnant women have nausea and vomiting, 25% have nausea only, and 25% are unaffected (6, 7). Recurrence of nausea and vomiting of pregnancy with subsequent pregnancies ranges from 15.2% to 81% (8). One study has attempted to categorize ...
