Many women go through their entire pregnancy without suffering from morning sickness. In fact, 2 out of 10 women will not have any morning sickness symptoms. So why do some women suffer from morning sickness while others don't?
The answer is complicated. Everyone is different and every pregnancy is different. However, if morning sickness runs in your family, if you have had morning sickness in a previous pregnancy, or if you are expecting multiples the chances are that you will have morning sickness in future pregnancies.
Miscarriages occur in 10-20 percent of known pregnancies and generally happen within the first 10-20 weeks of pregnancy. Miscarriages can be caused by age, health issues, and medication however; a lack of morning sickness is not a cause of miscarriage.
The reason for concern is because several studies on morning sickness showed that women with severe morning sickness were less likely to have a miscarriage than women who didn't have morning sickness.