What Causes Nausea and Vomiting in the Third Trimester of Pregnancy?

Many women experience significant nausea and vomiting early in pregnancy, which can cause considerable discomfort and even prevent normal eating. If left untreated for an extended period, this condition may impair the mother’s nutritional intake, thereby compromising fetal growth and development due to inadequate nutrient absorption. So, what causes nausea and vomiting in late pregnancy?

What Causes Nausea and Vomiting in Late Pregnancy?

A common cause of nausea and vomiting during late pregnancy is indigestion. This may result from overeating or consuming excessively greasy, spicy, or irritating foods. However, nausea should not automatically be attributed to indigestion—cholestasis of pregnancy (intrahepatic cholestasis of pregnancy, ICP) must also be considered. In rare cases, some women develop ICP in the third trimester, leading to nausea, vomiting, and even jaundice and pruritus (itching). Prompt medical evaluation—including blood tests to measure serum total bile acid levels—is essential. If ICP is diagnosed, dietary modifications are recommended: consume light, easily digestible meals; follow a low-salt, low-fat diet; and increase intake of fresh vegetables and fruits.

The underlying cause of nausea and vomiting in late pregnancy varies—and so do the appropriate treatments. If dietary factors—such as consumption of greasy or cold foods—are responsible, adjusting daily eating habits toward lighter, more moderate meals may gradually alleviate symptoms. If nausea stems from endocrine dysregulation, establishing regular daily routines, ensuring adequate sleep, and minimizing psychological stress are key therapeutic measures.

Patients are advised to maintain a bland, easily digestible diet and seek prompt medical evaluation and treatment upon noticing any discomfort—this helps prevent disease progression. We hope this information is helpful to you.