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Morning sickness - Overview

Alternative Names

Nausea in the morning - females; Vomiting in the morning - females

Definition of Morning sickness:

Morning sickness is nausea and vomiting that can actually occur at any time of the day during pregnancy.

Considerations:

Morning sickness is very common. Most pregnant women have at least some nausea, and about a third have vomiting. Morning sickness usually begins during the first month of pregnancy and continues through the 14th to 16th week (3rd or 4th month). Some women have nausea and vomiting through their entire pregnancy.

Morning sickness does not hurt the baby in any way unless you lose weight, such as with severe vomiting. The amount of morning sickness during one pregnancy does not predict how you will feel in future pregnancies.

Common Causes:

The exact cause of morning sickness is unknown. It may be caused by hormone changes or lower blood sugar during early pregnancy. Emotional stress, fatigue, traveling, or some foods can make the problem worse. Nausea in pregnancy is more common and can be worse with twins or triplets.

Morning sickness

Reviewed last on: 9/2/2009
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine; and Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Redmond, Washington; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Gordon MC. Maternal physiology. In: Gabbe SG, Niebyl JR, Simpson JL, eds. Obstetrics: Normal and Problem Pregnancies. 5th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2007:chap 3.

Nausea and vomiting of pregnancy. ACOG Practice Bulletin No. 52. American College of Obstetricians and Gynecologists. Obstet Gynecol. 2004;103:803-815.

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