A surge of a hormone made by fetuses triggers the stomach-turning nausea and vomiting of morning sickness, a new study suggests.
People who have naturally low levels of the protein in their blood before pregnancy are more susceptible to a severe form of morning sickness called hyperemesis gravidarum when hit with the rush of protein, researchers report December 13 in Nature. The findings could help identify people at risk of the severe illness and lead to treatments.
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