Until about five years ago, scientists believed the pregnancy hormone, human chorionic gonadotropin (hCG), was the culprit.

Pregnant woman pictured standing in front of a bathroom mirror holding her mouth as if she's going to be ill. Nausea and vomiting are extremely common in the early stages of pregnancy, and they've ...

Morning sickness can start as early as the fifth week of pregnancy. Most people see an improvement in symptoms by the end of the first trimester. Feeling sick during pregnancy is common and usually ...