Morning sickness has become synonymous with pregnancy in our culture. But certainly not all pregnant women experience. (A medical term used to refer to extreme forms is hyperemesis gravidarum). Only slightly more than half of pregnant women are afflicted with nausea.
Many people believe that pregnancy sickness is natural defense system of the body at work, protecting your baby from harmful toxins. It's easy to jump to the conclusion, then, that if you're not sick, your body should not protect your child from harmful toxins. It does not work that way. The bottom line is that no conclusive evidence that not being sick is a bad sign.
Nausea is caused by a number of factors. The most popular theory about morning sickness is that due to the high hormones, primarily estrogen and human chorionic gonadotropin. Researchers believe nausea may have to do with the amount of hormones circulating and perhaps the structure of certain hormones or your particular sensitivity to them. Also, if you have a pre-pregnancy tendency toward motion sickness, it may mean the brain area that controls nausea and vomiting are more sensitive.
Environment may also play a role. Smells like perfume, dog food or coffee, as well as motion and the sight of certain foods (a friend of mine almost instantly became nausea at the sight of a can of tuna) can all trigger nausea. Also, stress, fatigue, and operating on an empty stomach can make you more prone to gastrointestinal disorders.
The bottom line is that nobody really knows why some women get sick and others do not. It is important to know that if you have morning sickness has nothing to do with her pregnancy will be successful.
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