What is hyperemesis gravidarum and what are its symptoms?

By (gynecologist), (embryologist) and (psychologist).
Last Update: 12/05/2022

In the first trimester of pregnancy, nausea and vomiting are normal, especially in the early morning hours. However, when this nausea is intense and constant during pregnancy, it is hyperemesis gravidarum.

This condition may begin around 6-8 weeks of gestation but usually subsides by week 20. Hyperemesis gravidarum can have negative effects on the mother's health and that of the baby, so it must be treated appropriately.

What is Hyperemesis gravidarum?

When a woman is pregnant, morning sickness and vomiting are common (although they can occur at any time of the day). These symptoms occur most frequently during the first trimester of gestation and are generally thought to be due to a rapid increase in human chorionic gonadotropin (hCG) or estrogen.

Hyperemesis gravidarum would be a complication of this situation, so typical of pregnancy, which occurs in 0.3% to 3.6% of cases. It is the presence of intense and constant nausea and vomiting during pregnancy, which leads to avoidance of food intake and weight loss.

Hyperemesis gravidarum may begin to occur around 6-8 weeks of pregnancy, with symptoms being most pronounced around week 12. However, this condition tends to improve after the 20th week, although its duration may be prolonged.

If not properly treated, hyperemesis gravidarum can endanger and affect the health of both mother and baby.

Risk Factors

There are several factors that could increase the chances of developing hyperemesis gravidarum. Among them are:

  • Hyperemesis gravidarum in a previous pregnancy.
  • Twin or multiple pregnancy.
  • Molar pregnancy or hydatidiform mole.
  • Helicobacter pyloriinfection.

On the other hand, other risk factors such as obesity, pre-existing diabetes, young age and not having had children previously have also been proposed.


As mentioned, the main symptom of hyperemesis gravidarum is severe nausea and vomiting that persists during pregnancy. However, this situation can lead to the woman presenting:

  • Inability to eat and/or drink.
  • Weight loss greater than 5%.
  • Dehydration.
  • Malnutrition.
  • Low blood pressure (hypotension) and increased heart rate (tachycardia).
  • Alterations in the electrolyte balance of salts in the body.
  • Fatigue, dizziness and even fainting.
  • Temporary hyperthyroidism.
  • Excessive salivation.

In addition, due to the lack of nutrients and vitamins caused by hyperemesis gravidarum, the pregnant woman may develop anemia and other serious complications such as Wernicke's encephalopathy. On the other hand, damage to the esophagus can also occur from constant vomiting, which can lead to blood in the vomit.

Finally, as for the effects on gestation, hyperemesis gravidarum has been associated with preterm delivery, having a smaller baby than would be appropriate for its gestational age, and with low birth weight.

However, it is also very important to mention that constant vomiting and nausea reduce a woman's quality of life. The pregnant woman limits her activities and social contacts and may show symptoms of depression and anxiety. For this reason, support from family, friends, and, if necessary, psychological support is necessary. It should be understood that hyperemesis gravidarum is not usual nausea and vomiting.


The diagnosis of hyperemesis gravidarum is made on the basis of the patient's symptoms and weight loss. However, certain tests such as urine and blood test will also be performed to evaluate the woman's condition and to rule out other possible causes of vomiting.

In addition, the physician should perform an ultrasound in case there is a multiple or molar pregnancy.


As for the treatment of hyperemesis gravidarum, initially the woman can try certain remedies such as the following:

  • Rest.
  • Eat little and often.
  • Avoid excessively spicy foods, as well as fried foods.
  • Drink plenty of fluids, but little by little. If the liquid causes the pregnant woman to vomit, fruits may be another option.
  • Try to detect certain triggers of vomiting, such as odors or certain foods, and avoid them.

However, it is common that this advice is not sufficient and does not alleviate nausea and vomiting in pregnant women with hyperemesis gravidarum. Therefore, it is relatively common for a woman to visit her doctor when she has already lost weight and shows signs of dehydration.

Medical treatment

When the pregnant woman arrives at the hospital, the specialist will generally instruct the woman to stop eating and intravenous fluids will be administered.

In addition, electrolyte replacement and the administration of vitamins and antiemetics (drugs to reduce nausea and vomiting) are necessary according to the woman's needs and requirements. For this reason, the patient may require hospitalization for several days.

Once this is done, when the situation is more under control, the pregnant woman can gradually resume fluid intake. If these are tolerated, certain foods will be introduced in small quantities.

However, if the woman does not improve, other interventions such as tube feeding may be performed. In addition, in certain more extreme cases, the specialist may even propose a therapeutic termination of pregnancy.

FAQs from users

How much vomiting is considered hyperemesis gravidarum?

By Júlia Roig Navarro M.D. (gynecologist).

The number of vomiting is not what determines having hyperemesis gravidarum. If in doubt, a professional should be consulted for evaluation.
Read more

Is hyperemesis gravidarum common in the second trimester?

By Silvia Azaña Gutiérrez B.Sc., M.Sc. (embryologist).

Hyperemesis gravidarum usually appears around 6-8 weeks of gestation, which would correspond to the first trimester of pregnancy. However, hyperemesis gravidarum has a duration that does involve the second trimester, as it often begins to subside around the 20th week of gestation.

On the other hand, if the onset of vomiting is late in the second trimester, the specialist should carefully rule out other possible causes before diagnosing hyperemesis gravidarum.

Can hyperemesis gravidarum lead to sick leave?

By Silvia Azaña Gutiérrez B.Sc., M.Sc. (embryologist).

Yes, hyperemesis gravidarum is characterized by intense and constant nausea and vomiting, affecting the woman's quality of life and the performance of daily activities. In addition, weight loss and dehydration can even lead to hospitalization of the pregnant woman.

Is hyperemesis gravidarum the same as morning sickness?

By Silvia Azaña Gutiérrez B.Sc., M.Sc. (embryologist).

No. Morning sickness, so-called even though it can occur at any other time of the day, is very common in pregnant women and can occur in up to 80-90% of pregnancies.

Hyperemesis gravidarum is a less common form of nausea and vomiting during pregnancy, occurring in 0.3 to 3.6% of cases. However, it is a more severe condition, as the vomiting is constant and intense and can lead to weight loss and dehydration of the pregnant woman.

In this article, molar pregnancy has been mentioned as a possible risk factor for hyperemesis gravidarum. If you want to read more about this topic, we recommend you to visit the following link: Molar pregnancy or hydatidiform mole: types, symptoms, and diagnosis.

On the other hand, we have also mentioned that hyperemesis gravidarum has been related to premature delivery. For more information, you can read this article: What causes preterm labor - Risks, causes and symptoms

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FAQs from users: 'How much vomiting is considered hyperemesis gravidarum?', 'Is hyperemesis gravidarum common in the second trimester?', 'Can hyperemesis gravidarum lead to sick leave?' and 'Is hyperemesis gravidarum the same as morning sickness?'.

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Authors and contributors

 Júlia Roig Navarro
Júlia Roig Navarro
Dr. Júlia Roig has a degree in Medicine and General Surgery from the University of Barcelona (UB). In addition, she is a specialist in Gynecology and Obstetrics at the Hospital Universitari Arnau de Vilanova and has a Master in Human Assisted Reproduction from the Complutense University of Madrid and did an internship at the Quirón Dexeus center in Barcelona. More information about Júlia Roig Navarro
Member number: 56030
 Silvia Azaña Gutiérrez
Silvia Azaña Gutiérrez
B.Sc., M.Sc.
Graduate in Health Biology from the University of Alcalá and specialized in Clinical Genetics from the same university. Master in Assisted Reproduction by the University of Valencia in collaboration with IVI clinics. More information about Silvia Azaña Gutiérrez
License: 3435-CV
Adapted into english by:
 Cristina  Algarra Goosman
Cristina Algarra Goosman
B.Sc., M.Sc.
Graduated in Psychology by the University of Valencia (UV) and specialized in Clinical Psychology by the European University Center and specific training in Infertility: Legal, Medical and Psychosocial Aspects by University of Valencia (UV) and ADEIT.
More information about Cristina Algarra Goosman
Member number: CV16874

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