Pregnant women should know the causes of miscarriage and prevention of pregnancy. This is an important moment in every woman\’s life. However, during pregnancy, some unavoidable factors can cause pregnant women to miscarry. Different causes lead to different types of miscarriage. It is essential to understand the causes of miscarriage and how to prevent it. The following explains in detail the causes and prevention of miscarriage in pregnant women from four aspects. 1. Miscarriage caused by physical factors. Many women are prone to miscarriage due to congenital inheritance.