Sept. 26, 2016
A new analysis by researchers at the National Institutes of Health has provided the strongest evidence to date that nausea and vomiting during pregnancy is associated with a lower risk of miscarriage in pregnant women. The study, appearing in JAMA Internal Medicine, was conducted by researchers at NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) and other institutions.
Nausea and vomiting that occurs in pregnancy is often called “morning sickness,” as these symptoms typically begin in the morning and usually resolve as the day progresses. For most women, nausea and vomiting subside by the 4th month of pregnancy. Others may have these symptoms for the duration of their pregnancies. The cause of morning sickness is not known, but researchers have proposed that it protects the fetus against toxins and disease-causing organisms in foods and beverages.
“It’s a common thought that nausea indicates a healthy pregnancy, but there wasn’t a lot of high-quality evidence to support this belief,” said the study’s first author, Stefanie N. Hinkle, Ph.D, a staff scientist in NICHD’s Epidemiology Branch. “Our study evaluates symptoms from the earliest weeks of pregnancy, immediately after conception, and confirms that there is a protective association between nausea and vomiting and a lower risk of pregnancy loss.”