Recurring heartburn happens when stomach acid repeatedly flows back into your esophagus, and the most common reason is a problem with the muscular valve that separates the two. If you’re experiencing heartburn twice a week or more for several weeks, that crosses the line from occasional discomfort into chronic acid reflux, also known as GERD. Understanding what’s driving your symptoms is the first step toward making them stop.
The Valve That’s Supposed to Keep Acid Down
At the bottom of your esophagus, where it meets your stomach, there’s a ring of muscle that acts like a one-way gate. It opens to let food drop into your stomach and then tightens to keep acid from splashing back up. When this valve isn’t working properly, acid escapes upward and burns the lining of your esophagus. That burning sensation is heartburn.
Two patterns of dysfunction explain most cases. In the first, the valve relaxes at the wrong times, opening spontaneously when it shouldn’t. In the second, the valve’s resting pressure is simply too low, meaning it never fully seals. Both problems appear to stem primarily from faulty nerve signaling rather than weak muscle tissue itself. Your diaphragm also plays a supporting role in keeping the valve closed, which is why anything that disrupts that relationship (like a hiatal hernia) can make reflux worse.
Foods That Trigger Reflux
Certain foods cause your lower esophageal valve to relax and slow digestion at the same time, letting food sit in your stomach longer and giving acid more opportunity to escape. The biggest offenders are foods high in fat, salt, or spice. That includes fried food, fast food, pizza, processed snacks like potato chips, fatty meats like bacon and sausage, and cheese. Spices like chili powder, black pepper, and cayenne can also provoke symptoms.
What makes dietary triggers frustrating is that they vary from person to person. Some people can eat spicy food without issue but get wrecked by a greasy burger. Others find that tomato sauce or citrus is their main trigger. Keeping a simple food diary for a couple of weeks, noting what you ate before each episode, can reveal your personal pattern far more reliably than following a generic list.
Body Position, Timing, and Gravity
If your heartburn is worst at night or after lying down, gravity is working against you. When you’re upright, acid naturally stays in your stomach. When you lie flat, especially soon after eating, it can flow freely toward your esophagus.
Sleeping on your left side helps because of simple anatomy: in that position, your esophagus and its valve sit higher than your stomach, so acid drains away from the opening more quickly. Sleeping on your right side does the opposite, positioning the valve below the level of stomach acid. Elevating the head of your bed by about six inches (using a wedge pillow or blocks under the bed frame, not just extra pillows) also reduces nighttime symptoms. Eating your last meal at least two to three hours before lying down gives your stomach time to empty.
Hiatal Hernias and Anatomy Changes
A hiatal hernia occurs when the upper portion of your stomach pushes up through your diaphragm into your chest cavity. This disrupts the normal alignment between your diaphragm and your esophageal valve, weakening the barrier that keeps acid in your stomach. Studies from the US and Western Europe have found that 50 to 94 percent of patients with reflux-related esophageal inflammation also have a hiatal hernia, compared to just 13 to 59 percent in people without reflux problems.
Small hiatal hernias often cause no symptoms and don’t need treatment. Larger ones can make reflux significantly harder to control with lifestyle changes alone. If your heartburn doesn’t respond to the usual adjustments, a hiatal hernia may be worth investigating.
Medications That Make It Worse
Several common medications relax the esophageal valve as a side effect. Blood pressure medications in the calcium channel blocker family are among the most frequent culprits. Heart medications containing nitrates have a similar effect, relaxing smooth muscle throughout the body, including the valve between your stomach and esophagus. Certain anti-anxiety medications and some antidepressants can also contribute.
If you started a new medication around the time your heartburn became frequent, that connection is worth raising with whoever prescribed it. Alternatives often exist. Never stop a prescribed medication on your own because of heartburn, but knowing that a drug can cause reflux gives you a useful conversation starter.
Excess Weight and Abdominal Pressure
Extra weight around your midsection increases pressure inside your abdomen, which pushes against your stomach and forces acid upward. This is one of the reasons heartburn often worsens with weight gain and improves with even modest weight loss. Tight clothing, heavy lifting, and frequent bending at the waist create the same kind of pressure spike on a smaller scale. Pregnancy causes heartburn for exactly this reason: the growing uterus compresses the stomach while hormonal changes relax the esophageal valve simultaneously.
Other Habits That Contribute
Smoking weakens the esophageal valve over time. Alcohol relaxes it in the short term, which is why a glass of wine with a heavy dinner can be a reliable trigger. Carbonated drinks introduce gas into the stomach, increasing pressure and prompting the valve to open. Coffee and other caffeinated beverages can stimulate acid production, though sensitivity varies widely. Eating large meals stretches the stomach and increases the odds that acid will be pushed past the valve, so smaller, more frequent meals tend to cause less trouble.
What Happens If Reflux Goes Untreated
Occasional heartburn is uncomfortable but not dangerous. Chronic, untreated reflux is a different story. Repeated acid exposure can inflame and damage the lining of your esophagus, a condition called esophagitis, which can lead to scarring and narrowing over time. About 5 percent of people with chronic GERD develop Barrett’s esophagus, a condition where the cells lining the lower esophagus change in response to ongoing acid damage. Barrett’s carries a small but real risk of progressing to esophageal cancer, which is why it requires regular monitoring.
Difficulty swallowing, unintentional weight loss, vomiting, or the sensation that food is physically stuck in your chest or throat are all signs that reflux may have already caused structural damage. These warrant prompt medical evaluation.
How Frequent Heartburn Is Treated
Over-the-counter antacids neutralize stomach acid and work within minutes, but their effect is short-lived. For more persistent symptoms, acid-reducing medications called proton pump inhibitors (PPIs) are the standard treatment. They reduce the amount of acid your stomach produces, giving your esophagus time to heal. A large 2025 study across five Nordic countries found that long-term PPI use (defined as more than one year) does not appear to increase stomach cancer risk, which had been a lingering concern. That said, prolonged use has been linked to other issues, including a higher risk of certain gut infections, reduced bone density, and problems absorbing some vitamins and minerals. This is why periodic reassessment of whether you still need the medication makes sense.
For most people, the most effective approach combines medication with the lifestyle adjustments described above. Losing weight if you carry extra pounds, identifying and avoiding your specific food triggers, not eating close to bedtime, and sleeping on your left side can reduce or eliminate the need for daily medication over time. When reflux is driven by a large hiatal hernia or when symptoms persist despite aggressive treatment, surgical repair of the valve is an option that works well for carefully selected patients.