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Morning sickness affects about 70–80% of all pregnant women to some extent. About 60% of women experience vomiting. Hyperemesis gravidarum occurs in about 1.6% of pregnancies. Morning sickness can negatively affect quality of life, result in decreased ability to work while pregnant, and result in health-care expenses. Generally, mild to moderate cases have no effect on the fetus, and most severe cases also have normal outcomes. Some women choose to have an abortion due to the severity of symptoms. Complications such as Wernicke encephalopathy or esophageal rupture may occur, but very rarely.