Which Pregnancy Hormones Cause Nausea

Some hormones that can cause nausea include: Estrogen, which supports the development of the fetus and delivers nutrients to the fetus. Progesterone, which maintains immunity and protects the fetus during pregnancy. Human chorionic gonadotropin (hCG), which pregnant women only. HG presents in the first trimester of pregnancy, usually starting at 4 to 5 weeks gestation. In addition to severe nausea and vomiting, 60% of women with HG also have excess salivation or ptyalism [ 108 ].

Patients may also complain of gastroesophageal reflux symptoms such as retrosternal discomfort and heartburn. Oestrogen is produced in early pregnancy to support your baby until the placenta takes over. Oestrogen helps the development of your baby’s organs and the correct function of the placenta. Yet it may also cause nausea and make ligaments softer, putting pressure on your lower back and pelvis (NHS, 2018). Later in pregnancy, oestrogen helps to prepare your body for breastfeeding.