The most severe grade of NVP often leads to hyperemesis gravidarum (HG; see below), but it can be difficult to differentiate between the two conditions. A prospective study of more than 9000 ...

While nausea and vomiting of pregnancy (NVP) is common and affects up to 70% of pregnant women, HG occurs in a smaller percentage, ranging from 0.3% to 10.8% of pregnancies. Recent research has ...