Nausea at 38 weeks pregnant is more common than most people expect. About one in three women experience nausea and vomiting after the 20-week mark, and up to 10% of women have symptoms that persist all the way until delivery. While late-pregnancy nausea is usually caused by the same hormonal and physical forces that drove your first-trimester morning sickness, it can occasionally signal something that needs prompt attention.
Why Nausea Returns in Late Pregnancy
The hormones responsible for first-trimester nausea never actually went away. Progesterone and estrogen remain elevated throughout pregnancy, and both slow down your digestive system. Estrogen relaxes the smooth muscle lining your stomach and intestines, which delays how quickly food moves through. Progesterone does the same. The result is food sitting in your stomach longer than usual, which can trigger that familiar queasy feeling at any point during pregnancy.
At 38 weeks, your uterus is also taking up enormous space in your abdomen. It presses directly against your stomach, shrinking its capacity and pushing acid upward into your esophagus. This combination of slowed digestion and physical compression means even a normal-sized meal can leave you feeling overly full, bloated, and nauseous. Heartburn and acid reflux often come along for the ride, and both can worsen nausea on their own.
Your Baby Dropping Can Shift Symptoms
Around 38 weeks, many babies descend lower into the pelvis in preparation for birth. This shift, sometimes called “lightening,” can temporarily change which symptoms you notice. Some women find their heartburn and nausea improve as pressure lifts off the stomach. Others notice the opposite: the hormonal slowdown of digestion and the sheer size of the uterus still keep nausea going regardless of the baby’s position. If your nausea comes and goes over these final weeks, these positional changes are a likely reason.
Nausea as an Early Sign of Labor
At 38 weeks, your body could be gearing up for labor. Nausea and vomiting are well-recognized signs of early labor, and some women experience them hours or even a day or two before contractions become regular. This happens partly because prostaglandins, the chemical signals that help your cervix soften and your uterus contract, also affect your digestive tract. If your nausea is accompanied by lower back pain, cramping, diarrhea, or a feeling of increased pelvic pressure, labor may be approaching.
When Nausea Can Signal Something Serious
Most nausea at 38 weeks is harmless, but a few conditions that develop in the third trimester use nausea as an early warning sign. Knowing what else to look for can help you decide whether to call your provider.
Preeclampsia
Preeclampsia is a blood pressure disorder that develops after 20 weeks of pregnancy. Its hallmarks are a systolic blood pressure of 140 or higher, or a diastolic of 90 or higher, on two readings taken at least four hours apart. The most common complaint is a new, persistent headache that doesn’t respond to medication. Nausea or vomiting paired with pain in the upper right side of your abdomen or just below your breastbone is a recognized pattern. Visual disturbances like blurring, seeing spots, or light sensitivity can also appear. Severe-range readings (systolic 160 or above, diastolic 110 or above) require immediate evaluation.
HELLP Syndrome
HELLP syndrome is a serious complication related to preeclampsia that involves the breakdown of red blood cells, elevated liver enzymes, and low platelet counts. About 70% of cases occur between weeks 27 and 37, but 20% develop within 48 hours of delivery, making 38 weeks still within the window. Half of affected women report nausea or vomiting, and 90% have right upper quadrant pain. It can initially feel like a nonspecific viral illness, which makes it easy to dismiss. If your nausea is paired with pain under your right ribs and you feel generally unwell, contact your provider right away.
Cholestasis of Pregnancy
Cholestasis is a liver condition where bile flow slows and bile acids build up in your bloodstream. Its defining symptom is intense itching, particularly on the palms of your hands and soles of your feet, that worsens at night. There’s no rash. Nausea, loss of appetite, and yellowing of the skin or eyes are less common but possible. If itching is what’s driving you to search for answers alongside nausea, mention it to your provider. Cholestasis is diagnosed with a blood test and typically requires closer monitoring of the baby.
What Helps With Late-Pregnancy Nausea
The strategies that worked in your first trimester still apply, with some adjustments for the reality of a full-term belly.
- Eat small, frequent meals. Going too long without eating can make nausea worse. Five or six small meals spread through the day are easier on a compressed stomach than three large ones. Aim to eat something small in the morning before getting up and moving around.
- Stick with bland, dry carbohydrates. Dry toast, plain crackers, pretzels, and dry cereal are gentle on your stomach. Salty snacks like saltines can also help reduce nausea.
- Choose cold foods over hot ones. Cold foods produce less smell, and strong smells are a common nausea trigger. Chilled fruit, chicken salad, hard-boiled eggs, and fruit smoothies are good options that also deliver protein.
- Avoid fried and fatty foods. These take longer to leave the stomach, which compounds the digestive slowdown you’re already dealing with.
- Try ginger. Research supports ginger as an effective natural remedy for pregnancy nausea. Ginger tea, ginger chews, or ginger ale made with real ginger are all reasonable options.
- Stay hydrated. Sipping water or sucking on fruit ice pops made from 100% juice can help if drinking large amounts of water makes you feel worse.
Symptoms That Need Immediate Attention
The CDC lists severe nausea and vomiting as an urgent maternal warning sign when it’s accompanied by certain other symptoms. Call your provider or go to the hospital if you’re unable to keep water down for more than 8 hours, or unable to eat for more than 24 hours. A dry mouth, confusion, fever, dizziness, or lightheadedness alongside vomiting all warrant immediate care. The same goes for a sudden severe headache, vision changes, or pain under your ribs on the right side. These combinations can indicate preeclampsia, HELLP syndrome, or other complications that are treatable when caught early.