Nausea and vomiting of pregnancy is a common condition that affects the health of both the pregnant woman and her fetus. It can diminish the woman's quality of life. Hyperemesis gravidarum represents the extreme end of the spectrum of nausea and vomiting of pregnancy. The incidence of hyperemesis gravidarum is approximately 0.5–2% of pregnancies. The most commonly cited criteria include persistent vomiting not related to other causes and weight loss, most often at least 5% of pre-pregnancy weight. Electrolyte, thyroid, and liver abnormalities also may be present. Mild cases of nausea and vomiting of pregnancy may be resolved with lifestyle and dietary changes, and safe and effective treatments are available for more severe cases, sometimes requiring hospitalization, IV fluids and IV anti-nausea medications to get nausea/vomiting under control.