Study: No Proven Morning Sickness Treatments
Experts Find Limited Evidence for Treatments for Morning Sickness, and Some Side Effects
Sept. 8, 2010 -- Treatments for morning sickness, the nausea and vomiting experienced by up to 80% of pregnant women, are plentiful, from using acupuncture or eating ginger to taking vitamin B6.
But the evidence that any of these treatments work is limited, according to a new review.
''There's no strong evidence about any treatment for morning sickness," researcher Anne Matthews, RN, PHD, a registered midwife at Dublin City University in Dublin, Ireland, tells WebMD.
She and her colleagues looked at the results of 27 trials involving 4,041 women taking a range of treatments.
The bright spot about morning sickness? "It usually improves over time," Matthews says. The review is published in the Cochrane Database of Systematic Reviews. The Cochrane Reviews bring together research on health care and are viewed as the ''gold standard'' for determining how effective different treatments are.
But Matthews and other doctors who reviewed the study say it can't hurt to try treatments that are safe, and that they may help some women.
Morning Sickness Relief: A Closer Look
Matthews and her colleagues searched the register for the Cochrane Pregnancy and Childbirth Group's Trials, looking for studies that assigned women with morning sickness to a treatment group or a control group.
In the 27 trials that met their criteria, many treatments were studied, including:
- Acustimulation (mild electrical stimulation of an acupuncture point)
- Vitamin B6
- Anti-vomiting drugs
No studies of dietary or other lifestyle treatments were found that met the reviewers' criteria.
Morning sickness is a misnomer, Matthews tells WebMD, as it can occur any time of the day or night. It typically occurs mainly in the first trimester, from the 6th to the 12th week of pregnancy, but can last much longer.
Among the reviewers' findings:
- Evidence about the effectiveness of using acupressure on P6 (a point thought to control nausea and vomiting), ear acupressure, or acustimulation of the P6 points was limited. Some women who wore wristbands to stimulate their acupressure points reported discomfort in the area, Matthews says.
- Traditional acupuncture or P6 acupuncture ''showed no significant benefit to women in pregnancy."
- Ginger products may be helpful, but again the evidence was limited and not consistent. Some who took ginger reported heartburn.
- Vitamin B6 and anti-vomiting drugs had limited evidence of effectiveness for mild or moderate nausea and vomiting. Some who took the anti-vomiting drugs had drowsiness.