Frequent heartburn usually comes down to one core problem: the muscular valve at the top of your stomach isn’t closing tightly enough, allowing acid to splash back into your esophagus. If this is happening twice a week or more, it crosses the threshold from occasional nuisance into gastroesophageal reflux disease (GERD), a condition that affects roughly 20% of adults in Western countries. The good news is that most causes of worsening heartburn are identifiable and, in many cases, fixable without medication.
How the Valve Breaks Down
Your esophagus connects to your stomach through a ring of muscle called the lower esophageal sphincter (LES). When working properly, this valve opens to let food through, then snaps shut to keep stomach acid where it belongs. Relaxation of this valve is triggered by a chemical signal: nerve cells in the muscle wall release nitric oxide, which tells the sphincter to loosen. In people with frequent heartburn, this relaxation happens too often, lasts too long, or occurs at the wrong times.
Several things can weaken or disrupt this valve over time. Sometimes the cause is structural. A hiatal hernia, where the upper part of the stomach pushes up through the diaphragm, is found in 50 to 94% of patients with reflux-related esophageal damage. Even a small hernia can compromise the natural seal between the esophagus and stomach, making acid backflow far more likely. Many people have a hiatal hernia without knowing it, since it often produces no symptoms on its own until reflux becomes frequent.
Why It Gets Worse Over Time
Heartburn that seems to come out of nowhere, or that gradually intensifies over months, usually has an accumulation of contributing factors rather than a single dramatic cause. Here are the most common ones.
Weight Gain Around the Midsection
Abdominal fat directly increases the pressure inside your abdomen, and that pressure pushes against your stomach like squeezing a tube of toothpaste from the bottom. Research published in Gastroenterology found that waist circumference and the depth of abdominal fat correlate strongly with intra-abdominal pressure, enough to overwhelm even a normally functioning valve. Notably, it’s belly fat specifically that matters. Overall body weight (BMI) and hip-to-waist ratio showed weaker or no correlation with this pressure increase. If your pants have gotten tighter over the past year or two, that alone could explain why heartburn has become a regular event.
Dietary Patterns
High-fat meals slow down gastric emptying, meaning food sits in your stomach longer and produces more acid over a longer window. Fiber-heavy meals can do the same thing. Large portions compound the problem by physically distending the stomach, which stretches the valve and triggers relaxation through the same nerve pathways that normally open it during swallowing. Late-night eating is particularly problematic because lying down removes gravity as a barrier, letting pooled acid contact the esophagus for hours.
Common trigger foods vary from person to person, but the usual suspects include coffee, alcohol, chocolate, tomato-based sauces, citrus, and spicy foods. These don’t all work the same way. Some relax the valve directly, while others simply irritate esophageal tissue that’s already inflamed from prior acid exposure. Keeping a simple food diary for two weeks can help you identify your personal triggers more reliably than following a generic avoidance list.
Medications You May Not Suspect
Certain prescription drugs reduce the pressure of the lower esophageal sphincter as a side effect. Calcium channel blockers (commonly prescribed for high blood pressure), nitrate medications (used for chest pain), and theophylline (an older asthma drug) all fall into this category. NSAIDs like ibuprofen and naproxen don’t relax the valve, but they irritate the stomach lining and esophagus directly, which makes existing reflux feel significantly worse. If your heartburn started or worsened around the time you began a new medication, that connection is worth exploring with your prescriber.
Stress and Sleep
Stress doesn’t produce more stomach acid, but it does increase your sensitivity to the acid that’s already there. People under chronic stress report more severe heartburn symptoms at the same levels of acid exposure as people who aren’t stressed. Poor sleep creates a similar amplifying effect, and the relationship goes both ways: nighttime reflux disrupts sleep, and disrupted sleep lowers the pain threshold for reflux symptoms the next day.
When Frequent Means Too Frequent
The American College of Gastroenterology defines GERD as heartburn occurring two or more times per week, or any frequency that’s causing damage to the esophagus. If you’re reaching for over-the-counter antacids more than twice a week, that’s a signal the problem has moved beyond what occasional self-treatment can manage. Untreated GERD can lead to esophageal narrowing, chronic inflammation, and in a small percentage of cases, precancerous changes in the esophageal lining known as Barrett’s esophagus.
It’s also worth knowing that heartburn can sometimes mimic cardiac chest pain, and vice versa. Heartburn typically produces a burning sensation after meals that improves with antacids, often accompanied by a sour taste or the feeling of food rising into the throat. Heart-related chest pain more commonly involves pressure or squeezing that may radiate to the jaw, neck, or arms, along with shortness of breath, cold sweats, or dizziness. These features overlap enough that if you experience unexplained chest pain, especially with any of those additional symptoms, treat it as a potential cardiac event first.
Practical Changes That Reduce Acid Exposure
Before considering medication, lifestyle adjustments can meaningfully reduce how often acid reaches your esophagus. Losing even a modest amount of abdominal weight reduces intra-abdominal pressure and often provides more lasting relief than daily antacids. Eating smaller, lower-fat meals and finishing dinner at least three hours before lying down prevents the combination of a full stomach and a horizontal body.
For nighttime symptoms, elevating the head of your bed by 6 to 8 inches (15 to 20 cm) uses gravity to keep acid in your stomach while you sleep. This means raising the bed frame itself or using a wedge pillow, not simply stacking pillows under your head, which can bend your body at the waist and actually increase abdominal pressure. Sleeping on your left side also helps, since the stomach’s natural curve keeps the junction with the esophagus above the level of pooled acid in that position.
Tight clothing around the waist, especially belts and high-waisted pants, adds external pressure to the abdomen and can trigger reflux after meals in people who might otherwise be fine. Quitting smoking matters too: nicotine relaxes the lower esophageal sphincter and reduces saliva production, which normally helps neutralize any acid that does reach the esophagus.
What to Know About Acid-Reducing Medications
Proton pump inhibitors (PPIs) like omeprazole and lansoprazole are the most effective medications for suppressing stomach acid and healing esophageal inflammation. They work well for most people and are generally safe for short-to-medium-term use. Concerns about long-term PPI use and stomach cancer have circulated widely, but a large 2025 population-based study across five Nordic countries found no association between long-term PPI use and stomach cancer risk, suggesting that earlier studies showing a link had significant methodological flaws.
That said, long-term PPI use isn’t without tradeoffs. Extended use has been linked to increased risk of certain gut infections, reduced absorption of some vitamins and minerals, and lower bone density. These risks are modest for most people, but they reinforce the value of periodically reassessing whether you still need daily acid suppression or whether lifestyle changes have reduced your symptoms enough to step down. H2 blockers like famotidine are a less potent alternative that works well for milder or intermittent symptoms, with fewer long-term concerns.