Severe morning sickness
It's rare for morning sickness to become a serious concern. However, if you can't keep down any food or fluids for 24 hours, are steadily losing weight, or become dehydrated, it's time to call your practitioner. These symptoms can be signs of hyperemesis gravidarum, which literally means "excessive vomiting in pregnancy." It can cause dehydration severe enough for you to lose minerals crucial to you and your baby.
This condition is manageable once diagnosed and rarely has any serious long-term effects. Your caregiver will probably put you on intravenous (IV) fluids and check your electrolyte levels to make sure you have no underlying disease that might be provoking these frequent purges. Depending on your condition, you might even be hospitalized for a few days so that you can stay on antinausea medication and IV fluids. Most women feel much better after they're rehydrated and are able to use medication to stop vomiting.
Originally published in You & Your Baby: Pregnancy.
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