Pregnancy Morning Sickness Linked to Lower Risk of Miscarriage
A new data from the National Institutes of Health shows that morning sickness, nausea and vomiting during pregnancy, is linked to a lower risk of miscarriage. 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.
“Our study confirms that there is a protective association between nausea and vomiting and a lower risk of pregnancy loss.” —Stefanie N. Hinkle, Ph.D, Scientist, NICHD’s Epidemiology Branch
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.
Study of Pregnant Women
The study looked at data from all the women in the study who had a positive pregnancy test. The women kept daily diaries of whether they experienced nausea and vomiting in the 2nd through the 8th week of their pregnancies and then responded to a monthly questionnaire on their symptoms through the 36th week of pregnancy. The study authors noted that most previous studies on nausea and pregnancy loss were not able to obtain such detailed information on symptoms in these early weeks of pregnancy. Instead, most of studies had relied on the women’s recollection of symptoms much later in pregnancy or after they had experienced a pregnancy loss.