Causes
There are many theories about the causes of HG, but none have been confirmed. HG is a complex disease that is likely caused by many factors. Some of these include:
- Vitamin B deficiency
- Human chorionic gonadotropin (hyperemesis most severe during period of highest HCG levels)
- Hyperthyroidism (may be a result of high chorionic gonadotropin levels)
- Endocrine imbalances (high levels of estrogen)
- A multiple pregnancy (ie, twins or more)
- Brain nausea-control-center sensitivity to pregnancy changes
The Brain May Be Cause of Nausea
© 2009 Nucleus Medical Art, Inc.
Risk Factors
A risk factor is something that increases your chance of getting a disease or condition.
Some researchers have found that the following factors increase your chance of developing HR. If you have any of these risk factors, tell your doctor:
- History of HG in previous pregnancies
- Mother or sister with HG
- A multiple pregnancy
- Young maternal age
- No previous completed pregnancies
- First-time pregnancy
- Obesity
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