What Causes Nausea in the Third Trimester of Pregnancy?

　　In the late stages of pregnancy, some women experience severe nausea and vomiting—not only after eating but sometimes even upon smelling food. More notably, certain pregnant women may salivate excessively without any apparent cause. So, what causes nausea in the third trimester?

　　What Causes Nausea in the Third Trimester?

　　Nausea during the third trimester may stem from gastrointestinal indigestion. However, intrahepatic cholestasis of pregnancy (ICP) should not be ruled out as a potential cause. Clinically, a small number of pregnant women present with upper abdominal discomfort, nausea, vomiting, and loss of appetite—symptoms primarily associated with ICP. Yet, for the vast majority of women, ICP in the third trimester manifests predominantly as pruritus (intense itching). Serum total bile acid testing is essential for diagnosis, and treatment decisions should be based on the test results. Additionally, consuming light, easily digestible foods can help alleviate these symptoms.

　　Since the underlying causes of third-trimester nausea vary, so do the appropriate treatments. If nausea is diet-related, adjusting daily meals—focusing on light, bland foods and avoiding overeating—may gradually improve symptoms. If nausea results from endocrine dysregulation, lifestyle modifications are recommended: maintaining regular daily routines, ensuring adequate sleep, avoiding late-night activities, and minimizing psychological stress.

　　If a pregnant woman experiences severe nausea in the third trimester—especially when accompanied by anorexia and vomiting—she should seek prompt medical evaluation and treatment. We hope this information has been helpful to you.