Norovirus and pregnancy: An OB-GYN shares what you need to know
Canva/Motherly
Norovirus is a highly contagious virus that causes gastroenteritis, more commonly known as the “stomach bug” or “stomach flu.”
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Every year from November through April, norovirus season peaks across the United States—and if you’re pregnant, catching this highly contagious stomach bug requires a little more vigilance than usual. According to the Centers for Disease Control and Prevention (CDC), norovirus is the leading cause of foodborne illness in the U.S., and outbreaks spike during the colder months in crowded settings like schools, nursing homes, and cruise ships.
During the 2023–2024 season, the CDC reported a notable rise in outbreaks, with 91 cases reported in a single week in early December 2023, compared to 69 the week prior—well above typical early-December numbers. Getting a stomach bug while pregnant adds a layer of concern, but the good news is that with the right information and a solid plan, most pregnant people recover fully without complications.
We spoke with Dr. Li-Shei Lin, M.D., Ph.D., Reproductive Endocrinologist and OB-GYN at Reproductive Partners Fertility Center–San Diego, to get expert guidance on what norovirus means for pregnant people specifically, and how to protect yourself and your baby.
Related: What parents should know about hidden risks at splash pads, according to a new CDC report
Why norovirus is more concerning during pregnancy
Norovirus doesn’t directly infect the developing baby—but that doesn’t mean pregnancy and norovirus are a worry-free combination. The real risk, according to Dr. Lin, is dehydration.
“Norovirus does not infect the baby directly—dehydration is the real concern,” she explains. “Hydration supports blood volume, electrolyte balance and amniotic fluid levels, all of which are essential for fetal well-being. In pregnancy, protecting mom’s hydration protects the pregnancy.”
Trimester matters too. While dehydration is a concern at any stage, Dr. Lin notes that the stakes are especially high later in pregnancy: “In the third trimester, when fetal growth is most rapid and fluid demands are highest, maintaining hydration becomes especially critical.”
What are the risks of dehydration during pregnancy?
Dehydration is the complication to watch for when you’re dealing with a stomach bug while pregnant. Dr. Lin outlines what that can look like: “Dehydration during pregnancy can cause dizziness, lightheadedness, dark or decreased urine, rapid heart rate and in some cases uterine irritability or contractions. Significant electrolyte imbalance can worsen symptoms and delay recovery.”
The CDC also emphasizes that pregnant people should speak with their healthcare provider right away with any medical concerns or if they think they may have symptoms of norovirus, especially to prevent dehydration.
When to call your doctor (or go to the ER)
Dr. Lin is clear about the threshold for seeking care: “If you cannot keep fluids down for a full day, it is time to call your doctor.” More specifically, she advises seeking medical attention if you experience any of the following:
- Inability to tolerate fluids for 12 to 24 hours
- Minimal urine output
- Persistent vomiting
- Weakness or significant fatigue
- Fever
- Symptoms of severe dehydration: dry mouth, dizziness, or infrequent urination
- Concerns about the baby’s well-being or changes in fetal movement
“IV hydration can be simple, fast and very effective in preventing complications and stabilizing both mother and baby,” Dr. Lin adds. Don’t hesitate to reach out—that’s exactly what your provider is there for.
Related: Is it norovirus or Shigella? How to tell the difference
What is norovirus?
Norovirus is a highly contagious virus that causes gastroenteritis—more commonly known as the stomach bug or stomach flu. It spreads easily through contaminated food, water, and surfaces, or through close contact with an infected person. Symptoms typically appear 12 to 48 hours after exposure and usually resolve within one to three days in otherwise healthy individuals.
Common norovirus symptoms include:
- Nausea
- Vomiting
- Diarrhea
- Stomach cramps
One important note: even after symptoms resolve, you can continue to shed the virus for up to two weeks, meaning you can still spread it to others even when you feel better.
How to manage a stomach bug while pregnant
For most healthy pregnant patients, norovirus runs its course in about three days. “Most cases resolve with supportive care,” says Dr. Lin. “Treatment focuses on rest and gradual rehydration.”
Her advice for rehydrating when even water triggers nausea: “Think small, steady and consistent. Small, frequent sips of electrolyte-containing fluids are usually better tolerated than drinking large amounts at once.” She recommends oral rehydration solutions, diluted sports drinks, ice chips, or cold fluids. “Even a few teaspoons at a time can make a meaningful difference if taken consistently.”
Once nausea begins to improve, bland foods can be slowly reintroduced. As for over-the-counter medications for nausea or diarrhea: “Any medication should be discussed with a healthcare provider to ensure safety in pregnancy,” Dr. Lin cautions.
Can norovirus affect the baby?
The short answer: not directly. “Norovirus does not directly infect the fetus,” Dr. Lin confirms. “The baby depends on the mother’s fluid balance, so steady hydration is everything. Maintaining adequate amniotic fluid levels and maternal circulation is key to fetal well-being.”
The psychological impact of being sick during pregnancy is real too. As licensed clinical psychologist Dr. Shara Brofman notes, “What comes to mind as particularly psychologically difficult, not to mention the physical distress, is managing uncertainty—worrying about the illness’s impact on pregnancy and not knowing when the symptoms will end.”
Knowing that the virus won’t directly harm your baby—and that most cases resolve within days—can go a long way toward easing that anxiety.
How to prevent norovirus during pregnancy
Prevention is the best medicine, especially during the November–April peak season. Dr. Lin highlights a few key strategies: “Frequent handwashing with soap and water, avoiding close contact with infected individuals, careful food handling and good personal hygiene significantly reduce transmission risk.”
A few more specifics:
- Wash hands with soap and warm water for at least 20 seconds—especially before meals and after bathroom use. Hand sanitizers are NOT effective against norovirus.
- Disinfect high-touch surfaces regularly, especially if someone in your household is sick. Use a bleach-based disinfectant.
- Rinse fruits and vegetables thoroughly, and cook shellfish completely.
- Avoid sharing utensils, towels, or anything that could carry the virus.
- Even after recovery, continue precautions—you can shed the virus for up to two weeks after symptoms resolve.
Creating a care plan before you get sick
Having a plan in place before illness hits makes a stressful situation more manageable. Here’s what to prep:
- Keep your OB’s number and an after-hours line easily accessible.
- Stock a hydration kit: oral rehydration solutions, electrolyte drinks, herbal teas, and a reusable water bottle.
- Freeze easy-to-digest meals like soups and broths so you’re not cooking when you’re at your worst.
- Line up backup childcare if you have older kids who’ll need coverage while you rest.
- Identify a support person who can help with household tasks and errands during recovery.
- Keep a symptom log (on paper or in an app) tracking how you’re feeling, fluid intake, and any medications—this is helpful if you need to call your provider.
The bottom line
Getting a stomach bug while pregnant is unpleasant, but it’s usually short-lived and won’t directly harm your baby. The key is staying ahead of dehydration—small, frequent sips, electrolyte-rich fluids, and not waiting too long to call your doctor if you can’t keep fluids down. With the right information and a little preparation, you can get through this.
Sources:
- Pregnant With Norovirus? 2024. Newsweek. “Pregnant With Norovirus? Here’s Everything You Need to Know.“
- About Norovirus. 2024. Centers for Disease Control. “About Norovirus.“
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