Nausea and vomiting of pregnancy is a very common occurrence, but the reported incidence of hyperemesis gravidarum (a more severe form of vomiting in pregnancy) is much lower, estimated to vary from 0.3–3.6%. Studies have shown that nausea and vomiting of pregnancy is associated with improved fetal outcomes, such as lower rates of miscarriage. However, there are limited data on outcomes associated with hyperemesis gravidarum, which have focused on pregnancy and neonatal outcomes. Recently, studies showed adverse health outcomes, such as a reduction in insulin sensitivity in childhood and increased incidence of psychological disorders in adulthood. The effects of hyperemesis gravidarum in the offspring need to be further examined throughout childhood, adolescence, and into adulthood, so that long-term disease risks can be evaluated.