Nausea can be a sign that labor is approaching at 37 weeks, though it’s not a guarantee. Some women experience a bout of nausea and diarrhea roughly 24 to 48 hours before labor begins, triggered by the same hormones that prepare the cervix and uterus for delivery. But nausea at this stage can also come from a stomach bug, food sensitivity, or something more serious like preeclampsia, so the context matters.
Why Labor Causes Nausea
Your body ramps up production of prostaglandins in the days and hours before labor. These hormone-like compounds soften and thin the cervix, but they also affect the gut. The same prostaglandins that help your uterus prepare for contractions can speed up digestion, leading to loose stools, cramping, and nausea. This is why diarrhea and an unsettled stomach often show up as early signs that labor is on the way.
Once labor actually begins, nausea can intensify. Digestion typically slows or stops during active contractions, so food sitting in the stomach can make you feel sick. The transition phase of labor, when the cervix dilates from about 7 to 10 centimeters, is especially known for nausea and vomiting. Early contractions themselves can also trigger it.
What 37 Weeks Means for Timing
At 37 weeks, your pregnancy is classified as “early term,” which runs from 37 weeks through 38 weeks and 6 days. Your baby is viable and generally healthy at this point, but the lungs, liver, and brain are still going through a critical growth phase that continues until 39 weeks. Babies born before 39 weeks have a higher risk of breathing difficulties, feeding problems, trouble regulating temperature, and longer stays in the neonatal intensive care unit.
If your nausea at 37 weeks does turn out to be a pre-labor sign, it doesn’t necessarily mean something is wrong. Plenty of healthy babies arrive between 37 and 39 weeks. But it’s worth paying attention to what your body is doing alongside the nausea, since the timing can affect your baby’s readiness.
How to Tell It’s Labor-Related
Labor-related nausea rarely shows up alone. You’ll typically notice other signs alongside it:
- Irregular or regular contractions that feel like menstrual cramps or tightening across the abdomen
- Loose stools or diarrhea without an obvious dietary cause
- Low back pain that comes and goes or stays constant
- Loss of the mucus plug or a pinkish “bloody show”
- A feeling of pelvic pressure as the baby drops lower
If nausea is your only symptom, with no cramping, contractions, or changes in vaginal discharge, it’s less likely to be labor and more likely related to something else.
When Nausea Points to Something Else
A stomach virus is one common culprit. Gastroenteritis at 37 weeks typically comes with fever, fatigue, and watery diarrhea, which are not typical labor signs. Fever in particular helps distinguish a stomach bug from early labor, since contractions don’t cause a temperature spike. That said, the abdominal cramping and diarrhea from a stomach virus can mimic pre-labor symptoms, which makes it tricky to sort out on your own.
Preeclampsia is the more serious possibility. Nausea and vomiting can be symptoms of this pregnancy-specific condition, especially in its severe form. The distinguishing features of preeclampsia include a headache that won’t go away, blurry vision or seeing spots, swelling in the face and hands, and pain in the upper right side of the abdomen (under the ribs). If your nausea comes with any of these, it needs immediate medical attention. Preeclampsia can escalate quickly and is dangerous for both you and the baby.
Managing Nausea at 37 Weeks
Whether your nausea is pre-labor or not, several strategies can help you feel more comfortable. Stay hydrated with at least 2 liters of water a day, sipping small amounts rather than drinking large quantities at once. Eat small, bland meals every one to two hours to avoid both an empty and an overly full stomach. Dry carbohydrates like crackers before getting out of bed can settle things, and high-protein snacks between meals help stabilize blood sugar.
Peppermint tea, peppermint candy, and ice chips are all simple options that many women find effective. Ginger in capsule or tea form, up to 1,000 mg per day, has been shown in clinical trials to reduce nausea during pregnancy without safety concerns. Acupressure wristbands (sometimes sold as Sea-Bands) apply pressure to a point on the inner forearm about three finger-widths above the wrist, which can also ease symptoms.
Avoid strong-smelling or spicy foods, and try not to mix solids and liquids in the same sitting. Drinking fluids about 30 minutes before or after meals, rather than during, helps keep your stomach from getting too full. Getting enough sleep matters too, since fatigue makes nausea worse.
Signs That Need Immediate Attention
Nausea alone at 37 weeks is usually manageable. But certain combinations of symptoms signal that something more urgent could be going on. Seek care right away if you can’t keep fluids down for more than 8 hours or can’t eat for more than 24 hours. A dry mouth, dizziness, confusion, or dark urine are signs of dehydration that need medical evaluation.
Get to a hospital if your nausea is accompanied by sharp abdominal pain (especially on the right side), a severe headache that doesn’t respond to rest or fluids, visual changes like flashing lights or blind spots, or sudden swelling in your face or hands. These could indicate preeclampsia, liver problems, or other conditions where timing matters. If you also notice regular contractions coming five minutes apart or closer, your water breaking, or bright red bleeding, those are signs of active labor or complications that require prompt evaluation regardless of the nausea.