Hyperemesis gravidarum is the medical term for the most severe form of nausea and vomiting in pregnancy. It goes beyond typical morning sickness. According to the American College of Obstetricians and Gynecologists (ACOG), it occurs in up to 3 percent of pregnancies and may be diagnosed when a woman has lost 5 percent or more of her pre-pregnancy weight along with other signs of dehydration. Unlike ordinary morning sickness, this level of vomiting can affect your nutrition, your hydration, and your ability to function day to day.
Warning Signs That Need Prompt Medical Attention
Call your ob-gyn or other obstetric care provider right away if you notice any of these signs of dehydration, listed by ACOG:
- A small amount of urine that is dark in color
- Being unable to urinate
- Not being able to keep down any liquids
- Feeling dizzy or faint when standing up
- A racing or pounding heartbeat
These symptoms can signal that your body is losing fluids faster than you can replace them. Do not wait to see if it passes on its own.
Morning Sickness vs. Hyperemesis Gravidarum: What’s the Difference?
It can be hard to tell where ordinary morning sickness ends and a medical condition begins. This checklist can help you think through what you’re experiencing before you talk with your provider.
| Sign | Typical Morning Sickness | Possible Hyperemesis Gravidarum |
| Vomiting | Occasional, most food and liquid stays down | Frequent, unable to keep down liquids |
| Weight change | Stable or mild loss | Significant weight loss |
| Hydration | Normal urination and energy | Signs of dehydration (see warning signs above) |
| Daily function | Manageable with rest and diet changes | Difficulty working, eating, or caring for yourself |
This table is for general education. Only a qualified healthcare provider can diagnose hyperemesis gravidarum. According to MedlinePlus, ordinary morning sickness does not harm the baby unless it leads to weight loss, which is one reason providers pay close attention to how much you’re able to eat and drink.
Who Is More Likely to Develop This Condition?
ACOG notes that certain factors can raise the risk of severe nausea and vomiting in pregnancy, including:
- Being pregnant with more than one baby (multiple pregnancy)
- A previous pregnancy with mild or severe nausea and vomiting
- A mother or sister who had severe nausea and vomiting during pregnancy
If any of these apply to you, mention it to your provider early in pregnancy so you can make a plan together.
When Symptoms Might Point to Something Else
ACOG explains that some other medical conditions can also cause nausea and vomiting during pregnancy. Your provider may look more closely if symptoms start for the first time after 9 weeks of pregnancy, since this pattern is less typical of ordinary morning sickness. This is one reason it’s worth describing your symptoms and their timing in detail at your appointments, rather than assuming everything is “just morning sickness.”
Evidence-Based Treatment Options
Treatment is usually approached in steps, starting with the least invasive options and moving up if symptoms don’t improve. This information is educational. Your provider will decide what’s right for your situation.
- Dietary changes. ACOG suggests eating five or six small meals a day instead of three large ones, so your stomach is never empty. Bland, low-fat foods and eating dry crackers or toast before getting out of bed are common first steps.
- Ginger. ACOG notes ginger can help settle the stomach for some women.
- Vitamin and medication options. ACOG describes vitamin B6 as a safe over-the-counter option that may be tried first, with doxylamine sometimes added if B6 alone isn’t enough. A combination prescription product is also available. Additional anti-nausea medications may be considered if these don’t relieve symptoms. Only your provider can tell you which option, dose, and timing are appropriate for you.
- IV fluids and hospital care. ACOG states that women with hyperemesis gravidarum sometimes need treatment in a hospital to stop the vomiting and restore fluids lost to dehydration.
Never start, stop, or change any medication or supplement during pregnancy without first talking to your ob-gyn or other qualified obstetric care provider.
A Note on Extra Caution
If you are carrying more than one baby, have had hyperemesis gravidarum in a previous pregnancy, or have a family history of it, talk with your provider as early as possible. Early conversations can help your care team watch for symptoms sooner and respond faster if they develop.
Frequently Asked Questions
Is hyperemesis gravidarum dangerous for my baby?
According to MedlinePlus, ordinary morning sickness does not hurt the baby unless it causes weight loss, such as with severe vomiting. This is why providers monitor weight, hydration, and nutrition closely when nausea and vomiting become severe. Your provider is the best source for guidance specific to your pregnancy.
How is hyperemesis gravidarum diagnosed?
ACOG notes this condition may be diagnosed when a woman has lost 5 percent or more of her pre-pregnancy weight along with other problems related to dehydration. Diagnosis is made by a qualified healthcare provider based on your symptoms, weight history, and an exam. This article cannot diagnose your symptoms.
Can I treat severe morning sickness at home?
Mild to moderate nausea is often managed at home with dietary changes and rest, per ACOG. But if you have any signs of dehydration listed above, or cannot keep down liquids, contact your provider. Severe cases may need in-person or hospital care.
When does morning sickness usually improve?
ACOG’s patient guidance notes that nausea and vomiting of pregnancy commonly eases as pregnancy progresses for many women, though the exact timing varies by person. Hyperemesis gravidarum can last longer and needs medical support. Talk with your provider about what to expect in your specific pregnancy.
Evidence Limits
This article summarizes general patient guidance from ACOG and MedlinePlus. It does not cover every possible cause of nausea and vomiting in pregnancy, every treatment option, or every individual risk factor. Research on some remedies, such as acupressure, has produced mixed results. Guidelines may be updated as new research becomes available, so always confirm current recommendations with your own provider.
Educational Disclaimer
This article is for general educational purposes only. It does not diagnose any condition, recommend any specific treatment, or replace medical advice from a qualified healthcare provider. If you are pregnant and experiencing severe nausea, vomiting, or any warning signs described above, contact your ob-gyn or other obstetric care provider promptly. Learn more about how we source and review our content in our Editorial Policy, and see our full Medical Disclaimer. You can also read more About Reproductive Health Center.