Yes, nausea during the third trimester is common. While most people associate pregnancy nausea with the first trimester, digestive symptoms actually increase as pregnancy progresses. Over half of pregnant women experience upper gastrointestinal symptoms like heartburn, regurgitation, and nausea by the third trimester, compared to about a quarter in the first trimester. The causes are different from early-pregnancy morning sickness, and in most cases, third-trimester nausea is uncomfortable but not dangerous.
Why Nausea Returns (or Gets Worse) Late in Pregnancy
Third-trimester nausea has two main drivers working together: hormones and physical compression. Progesterone, which rises throughout pregnancy, relaxes smooth muscle tissue throughout your body. That includes the valve between your esophagus and stomach, which normally keeps stomach acid where it belongs. When that valve relaxes, acid can creep upward, causing heartburn and nausea. Progesterone also slows down the movement of food through your digestive tract. Studies measuring gut transit time found it was longest in the third trimester, when progesterone and estrogen levels were at their peak.
On top of the hormonal effects, your uterus is now large enough to push up against your stomach. There is simply less room for food, which means your stomach fills faster and empties slower. This combination of sluggish digestion and physical crowding is why many women feel queasy after meals, even if their first-trimester nausea resolved months ago.
Acid Reflux Often Feels Like Nausea
A lot of what registers as “nausea” in late pregnancy is actually acid reflux. In a study of 510 pregnant women, 51% had reflux symptoms by the third trimester, up from 26% in the first trimester. About 41% experienced weekly regurgitation, and 10% had daily heartburn. For comparison, fewer than 10% of non-pregnant women reported reflux symptoms at all.
Reflux doesn’t always feel like classic heartburn. It can show up as a sour taste, a feeling of fullness in the throat, or just a low-grade wave of nausea that seems to come out of nowhere. The good news: the valve between your esophagus and stomach returns to normal pressure after delivery, so these symptoms resolve.
When Nausea Has Been There All Along
Some women never get a break from nausea. Hyperemesis gravidarum, the severe form of pregnancy nausea and vomiting, can begin before six weeks of gestation and persist through the third trimester and even into delivery. If you’ve been managing ongoing nausea since early pregnancy, a late-pregnancy flare doesn’t necessarily mean something new is wrong, but it can become harder to control as the physical and hormonal pressures of the third trimester pile on. Early and consistent management tends to prevent symptoms from escalating to the point of dehydration or weight loss.
Eating Strategies That Help
The single most effective dietary change is switching from three standard meals to five or six smaller ones spread across the day. Splitting your protein intake across those meals helps keep your stomach moving and prevents the blood sugar dips that can worsen nausea. Each meal or snack should include some protein: yogurt, a boiled egg, nuts, or legumes all work well.
Aim for most of your energy to come from complex carbohydrates like whole grains, starchy vegetables, and legumes, which stabilize blood sugar more effectively than simple sugars. Keep saturated fat low, since it slows stomach emptying and can make nausea worse. Olive oil, avocado, nuts, and seeds are better-tolerated fat sources.
Temperature and smell matter more than you might expect. Cold or room-temperature foods like salads, smoothies, cottage cheese, and cold chicken are often easier to handle than hot dishes, which release stronger aromas. Cooking in a well-ventilated space, avoiding heavily seasoned or fried foods, and staying away from strong smells can all reduce triggers. If certain foods make your nausea spike, trust your instincts and skip them for now.
When Nausea Signals Something Serious
Most third-trimester nausea is a nuisance, not a warning sign. But nausea is also a symptom of a few conditions that require prompt attention.
Preeclampsia is a serious blood pressure condition that develops after the midpoint of pregnancy. Nausea or vomiting that appears suddenly and wasn’t there before can be one of its symptoms, especially alongside headaches, vision changes, swelling in the face or hands, or pain under the ribs on the right side. Johns Hopkins Medicine lists sudden-onset nausea or vomiting after mid-pregnancy as a reason to call your obstetrician right away.
Cholestasis of pregnancy is a liver condition most common in the third trimester. Its hallmark symptom is intense itching, particularly on the palms of your hands and soles of your feet, that worsens at night. Nausea, loss of appetite, and yellowing of the skin can accompany the itching, though they’re less common. Cholestasis requires monitoring because elevated bile acids in the bloodstream can affect the baby.
The key distinction is whether your nausea fits the pattern of ongoing digestive discomfort that improves with small meals and position changes, or whether it’s new, sudden, constant, and resistant to everything you try. Persistent vomiting, inability to keep food or fluids down, or nausea paired with any of the symptoms above warrants a call to your provider rather than a wait-and-see approach.
Nausea as a Sign of Early Labor
As you approach your due date, nausea can also signal that labor is getting close. The Cleveland Clinic lists nausea among the signs that labor may be beginning, caused either by the pain of early contractions or by your baby dropping lower into your pelvis and increasing pressure on your digestive system. This type of nausea typically comes on alongside other labor signs like regular tightening, low back pain, or a change in vaginal discharge. On its own, nausea isn’t a reliable predictor of labor, but combined with other cues, it may mean things are moving in that direction.