Researchers said that the discovery could lead to better treatments for morning sickness, including rare, life-threatening cases of it.
The researchers found that the amount of hormone circulating in a woman's blood during pregnancy as well as her exposure to it before pregnancy drives the severity of her symptoms.
And roughly 2 percent of women are hospitalized for a condition called hyperemesis gravidarum, which causes relentless vomiting and nausea throughout the entire pregnancy.
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