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April 15, 2023

Our HG Experts Answer the Web’s Most Commonly Searched Questions about HG

HER’s HG experts answer common questions

Do you want to learn more about hyperemesis gravidarum (HG)? HER’s HG experts are here to clarify the conversation surrounding hyperemesis and clear up misconceptions.

How sick is too sick when pregnant? 

If you are losing weight, aren’t making as much urine, or cannot function due to nausea and vomiting of pregnancy, then you may have or be developing HG. You can have hyperemesis gravidarum even if you have not had significant weight loss or dehydration. 

What is HG?

HG is hyperemesis gravidarum. An international consensus development process established the following definition: nausea and vomiting that begins in early pregnancy, is not caused by another condition, and has both a severe inability to eat and drink normally, and a severe effect on daily activity.

What is nausea and vomiting of pregnancy (NVP)?

Nausea and vomiting of pregnancy (NVP) is a spectrum. On the mild end is morning sickness or mild NVP which can be addressed with rest and home remedies. On the severe end is Hyperemesis Gravidarum which requires medical care. ~80% have NVP. Only 2-3% are diagnosed with HG.

What is the difference between morning sickness and Hyperemesis Gravidarum (HG)? 

Nausea and vomiting are common in pregnancy. Morning sickness is mild NVP that does not greatly interfere with intake of food and fluids. Those with morning sickness may find they need to rest more and avoid some foods. The symptoms do not greatly impact their day.

Can severe vomiting during pregnancy harm the baby?  

If you’re unable to stay hydrated and take in nutrients and calories for an extended period of time due to vomiting, your baby is at higher risk for some complications.  

What is the cause of Hyperemesis Gravidarum (HG)?

Using genetics, the HER Foundation, led by Marlena Fejzo, PhD., found the cause of HG is related to the nausea and vomiting hormone GDF15.  

Does HG increase the risk of miscarriage? 

Those with HG have an increased risk of pregnancy loss compared to non HG patients. Proactive care is essential for HG. Ineffectively treated or prolonged HG may cause complications for mother and baby(s).

What are the symptoms of HG? 

If you can’t keep down food or stay hydrated, and can’t do your normal activities or take care of yourself, those are all signs of HG. 

How much vomiting is too much during pregnancy? 

If you are vomiting so much or so nauseous that you can’t eat or keep food down or stay hydrated, then you need to receive medical care. If vomiting is interfering with your day, please contact your doctor.

Is Hyperemesis Gravidarum (HG) called severe morning sickness? 

Severe morning sickness is not an accurate term because there is no accepted definition of severe morning sickness. Morning sickness is part of a normal pregnancy and hyperemesis is not. The phrase is used in media articles to help patients who may not have heard of the diagnosis of hyperemesis gravidarum. 

My friends say it’s good I’m losing weight because I was overweight, is that true? 

Pregnancy is not the time to go on a diet. Even with a high BMI, HG can lead to malnutrition which can harm both the pregnant person and the baby. 


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©2023 HER Foundation. All rights reserved.

Posted in News, What is HG
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