No one knows for sure about the causes of nausea during pregnancy. However, nausea that occurs is likely a combination of changes in physical and hormonal in a woman's body during pregnancy. Nausea during pregnancy is experienced by most pregnant women. Only less than 20 percent of pregnant women do not experience it. This condition is common in early pregnancy, especially the first week to the third month, and the suspected cause is hormonal changes. Even so, some women experience nausea for a longer time. Although nausea during pregnancy is often referred to as morning sickness, but actually this condition can occur at any time. Good morning, noon, or night. In fact, some pregnant women experience it throughout the day. Causes of Nausea During Pregnancy The exact cause of nausea during pregnancy is still not known with certainty. However, nausea in pregnant women is often associated with several factors, including: Pregnancy hormone production. When a fertilized egg attach...