Morning Sickness (Vomiting During Pregnancy)
Morning Sickness (Vomiting During Pregnancy) Overview
While you are pregnant, nausea and vomiting are common. A majority of women get mild to moderate symptoms during the first three months (first trimester) of pregnancy. These symptoms are usually gone by the fourth month.
Although this condition is often called morning sickness, most women have symptoms throughout the day.
Vomiting During Pregnancy Causes
The exact cause of nausea and vomiting in pregnancy is not clear. Most evidence points to rapid changes in hormone levels. These fluctuations may cause changes in the muscle contraction and relaxation patterns of your stomach and intestines, thus leading to nausea and vomiting.
The hormones that seem to have the most to do with this process include the pregnancy hormone human chorionic gonadotropin (hCG), estrogen, and progesterone. Abnormal levels of thyroid hormones have also been reported in women with severe vomiting, although a cause-and-effect relationship remains unclear. Some studies have shown that nausea is worse when your blood sugar level is low. Some researchers have found that women who are more likely to have nausea from birth control pills, migraines, or motion sickness are at higher risk for nausea and vomiting in pregnancy.
If you have a family history of hyperemesis gravidarum, you are more likely to have the condition. What causes hyperemesis gravidarum remains unknown despite active research.
The more popular theories fall into three areas:
Medically Reviewed by a Doctor on 5/30/2014
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