Heartburn is one of the most common discomforts of pregnancy. Studies estimate that roughly 40% to 80% of pregnant women experience it at some point, with symptoms peaking in the third trimester. If you’re dealing with that burning sensation behind your breastbone, you’re far from alone, and there are clear reasons why pregnancy makes it so much more likely.
How Common It Is by Trimester
Heartburn can show up at any stage of pregnancy, but it doesn’t hit evenly across all nine months. In a study of 400 pregnant women, about 35% experienced weekly heartburn in the first trimester, 31% in the second, and nearly 47% in the third. That jump in the final months is significant and consistent with what most pregnant women report: the closer you get to your due date, the worse it tends to get.
Some women notice heartburn for the first time ever during pregnancy, while others who had occasional reflux before find it suddenly much more frequent. Either pattern is normal.
Why Pregnancy Causes Heartburn
The main driver is progesterone, the hormone that rises steadily throughout pregnancy to support the developing baby. Progesterone has a direct relaxing effect on smooth muscle throughout the body, including the ring of muscle at the bottom of your esophagus that normally keeps stomach acid from flowing upward. As progesterone levels climb, that muscular seal weakens, and acid escapes more easily into the esophagus.
This hormonal explanation is actually more important than the physical one. It’s a common belief that the growing uterus pushes the stomach upward and squeezes acid out, but research published in the American Journal of Obstetrics & Gynecology found that increased abdominal pressure alone doesn’t cause reflux. In studies of patients with raised abdominal pressure from other causes, none developed heartburn or acid reflux. The evidence points firmly to progesterone as the primary culprit, which also explains why some women get heartburn well before their belly is noticeably larger.
Lifestyle Changes That Help
For mild to moderate symptoms, non-medical approaches are the standard starting point. The most commonly recommended strategies include:
- Eating smaller, more frequent meals rather than three large ones, which reduces the volume of food sitting in your stomach at any given time.
- Avoiding late-night eating. Giving yourself two to three hours between your last meal and bedtime allows your stomach to empty before you lie down.
- Elevating the head of your bed. Propping the head end up by a few inches (using a wedge pillow or blocks under the bed legs) lets gravity work in your favor overnight.
- Chewing gum after meals. This stimulates saliva production, which helps neutralize acid in the esophagus.
- Identifying personal food triggers. Spicy foods, citrus, chocolate, coffee, and fatty or fried foods are frequent offenders, though your triggers may differ.
It’s worth noting that a Cochrane review of heartburn treatments in pregnancy found limited high-quality evidence on how well lifestyle changes work on their own. In one small trial, a medication outperformed dietary and lifestyle advice alone for complete symptom relief. That doesn’t mean these strategies are useless. They often take the edge off milder symptoms, and they carry no risk. But if you’re still miserable after making these adjustments, medication is a reasonable next step.
Medications During Pregnancy
Over-the-counter antacids (the chalky, chewable kind) are generally considered a safe first option for occasional flare-ups. They work by directly neutralizing stomach acid and provide quick, short-lived relief.
When antacids aren’t enough, acid-reducing medications called H2 blockers are a well-studied option. A meta-analysis pooling data from nearly 2,400 pregnant women who took H2 blockers found no increased risk of miscarriage, preterm delivery, or growth restriction compared to unexposed pregnancies. These medications reduce the amount of acid your stomach produces rather than just neutralizing what’s already there, so they tend to work longer.
Proton pump inhibitors, the strongest category of acid-suppressing medication, are sometimes used for severe symptoms that don’t respond to other treatments. Talk with your provider about which specific option makes sense for your situation, since the safety data varies somewhat between individual medications in this class.
Herbal Remedies: What the Evidence Shows
Ginger is the best-studied herbal option in pregnancy. The FDA considers it “generally regarded as safe,” and a meta-analysis of nearly 1,300 pregnant women found it significantly improved nausea symptoms. Doses under 1,000 mg per day did not increase adverse effects for either mother or baby. While most of the research focuses on nausea rather than heartburn specifically, ginger’s effect on digestive discomfort makes it a reasonable option for mild symptoms.
Peppermint, often used for nausea and indigestion, is classified as safe in normal doses during pregnancy. Animal studies found no developmental harm at standard doses. However, excessive use has been linked to uterine bleeding in early pregnancy, so moderation matters.
Chamomile tea is popular for digestive relief, and one small trial found it reduced nausea and vomiting more effectively than placebo. But there’s a caution here: one study found that 21.6% of regular chamomile users during pregnancy had a higher frequency of threatening miscarriage and preterm labor compared to non-users. That correlation doesn’t prove chamomile caused those outcomes, but it’s enough reason to use it sparingly rather than daily.
When Upper Belly Pain Isn’t Just Heartburn
Most pregnancy heartburn is uncomfortable but harmless. However, pain in the upper abdomen, particularly under the ribs on the right side, can also be a symptom of preeclampsia or a related condition called HELLP syndrome. These are serious pregnancy complications that require immediate medical attention.
The tricky part is that preeclampsia symptoms overlap with ordinary pregnancy complaints. Headaches, nausea, and general aches are all normal parts of pregnancy. The distinguishing features to watch for are upper belly pain (especially right-sided) that feels different from your usual heartburn, combined with severe headache, vision changes, sudden swelling, or a general sense that something is wrong. New or unusual upper abdominal pain after 20 weeks of pregnancy, particularly if it doesn’t respond to antacids or feels more like pressure than burning, warrants a call to your provider.
What Happens After Delivery
The good news is that pregnancy heartburn has an expiration date. Studies tracking esophageal sphincter pressure have shown that it progressively weakens as pregnancy advances but returns to normal values about four weeks after delivery. For women who had no reflux problems before pregnancy, symptoms typically resolve completely once the baby arrives and progesterone levels drop. If heartburn persists well beyond the postpartum period, it may indicate an underlying tendency toward reflux that pregnancy unmasked rather than caused.