Frequent heartburn happens when stomach acid repeatedly flows backward into your esophagus, the tube connecting your mouth to your stomach. If you’re dealing with this more than twice a week, you’ve likely crossed from occasional heartburn into gastroesophageal reflux disease (GERD), a condition that affects more than 60 million people in the United States on a weekly basis. The good news: most causes are identifiable and fixable.
How Heartburn Actually Works
At the bottom of your esophagus sits a ring of muscle that acts like a one-way valve. It opens to let food drop into your stomach, then closes to keep acid from splashing back up. When that valve weakens or relaxes at the wrong time, stomach acid creeps into the esophagus, which has no protective lining against it. That’s the burning sensation you feel behind your breastbone.
The valve doesn’t have to be broken to cause problems. It just needs to be slightly too relaxed. When the pressure holding it shut drops to within a few points of the pressure inside your stomach, acid flows freely upward. Several things can tip that balance, from what you eat to how much body fat you carry to medications you take daily.
Foods That Make It Worse
Certain foods relax that valve and slow digestion at the same time, keeping food in your stomach longer and giving acid more opportunity to escape. The biggest offenders are foods high in fat, salt, or spice: fried food, fast food, pizza, bacon, sausage, cheese, and processed snacks like potato chips. These are worth tracking first if your heartburn has ramped up recently.
Other common triggers work through slightly different mechanisms. Tomato-based sauces and citrus fruits are acidic enough to irritate the esophagus directly. Chocolate and peppermint relax the valve. Carbonated beverages introduce gas that increases pressure inside the stomach. You don’t necessarily need to eliminate all of these permanently. But if you’re trying to figure out why your heartburn has gotten worse, keeping a simple food log for a week or two can reveal a pattern surprisingly fast.
Body Weight and Abdominal Pressure
Carrying extra weight around your midsection is one of the strongest predictors of worsening heartburn. The mechanism is straightforward: more abdominal fat increases the pressure inside your stomach, which pushes acid upward against that valve. Extra weight also increases the frequency of inappropriate valve relaxations, where the muscle opens briefly for no digestive reason and lets acid through.
There’s a hormonal layer to this as well. Fat tissue produces estrogen, and higher circulating estrogen levels appear to trigger more of those spontaneous valve relaxations, particularly in women. This means the connection between weight and heartburn isn’t purely mechanical. Even modest weight gain, especially around the belly, can noticeably increase reflux episodes. And the reverse is true: losing weight is one of the most effective long-term fixes for chronic heartburn.
Medications That Trigger Reflux
If your heartburn started or worsened around the time you began a new medication, the drug itself could be the cause. Two categories of medications cause problems in different ways.
Some medications directly irritate the esophageal lining as they pass through. These include common pain relievers like ibuprofen and aspirin, certain antibiotics, iron supplements, and bone-density drugs. Taking these with a full glass of water and staying upright afterward helps, but the irritation can mimic or amplify heartburn.
Other medications actually weaken the valve between your esophagus and stomach. Blood pressure drugs (calcium channel blockers, ACE inhibitors, nitrates), certain antidepressants, sedatives, opioid painkillers, and overactive bladder medications all fall into this category. If you suspect a medication is contributing, talk to your prescriber about alternatives or timing adjustments rather than stopping anything on your own.
Pregnancy and Hormonal Changes
Pregnancy is one of the most common reasons for a sudden increase in heartburn. Progesterone, which rises dramatically during pregnancy, relaxes smooth muscle throughout your body, including that esophageal valve. Progesterone also slows digestion, keeping food in the stomach longer and creating more opportunity for acid to reflux.
As pregnancy progresses, the growing uterus adds physical upward pressure on the stomach, compounding the hormonal effect. This is why heartburn often worsens in the second and third trimesters even if you’ve never had it before. The condition typically resolves after delivery once hormone levels normalize and the physical pressure is gone.
Hiatal Hernia
A hiatal hernia occurs when the upper part of your stomach pushes through the small opening in your diaphragm where the esophagus passes through. Normally, the diaphragm helps reinforce that esophageal valve. When the stomach slides upward into the chest cavity, it disrupts this support system. A small hiatal hernia may cause no symptoms at all, but a larger one allows food and acid to back up into the esophagus easily, causing persistent heartburn that doesn’t respond well to dietary changes alone.
Hiatal hernias become more common with age and are more likely in people who are overweight or who smoke. They’re often discovered during an endoscopy or imaging study ordered for other reasons.
When Occasional Becomes Chronic
Everyone gets heartburn now and then. But when it becomes a regular occurrence, the repeated acid exposure starts to damage the esophageal lining. Between 10% and 15% of people with long-standing GERD develop a condition called Barrett’s esophagus, where the tissue lining the esophagus changes to resemble intestinal tissue. This typically happens after at least 10 years of chronic reflux. Repeated acid exposure can also cause the esophagus to narrow over time from scarring, making swallowing progressively harder.
Pay attention to certain warning signs that suggest something more serious is going on. Difficulty swallowing, a sensation of food getting stuck in your chest or throat, unintentional weight loss, or vomiting alongside your reflux all warrant prompt medical evaluation. These symptoms can point to esophageal narrowing, significant inflammation, or other conditions that need more than over-the-counter treatment.
Treatment Options and What to Expect
Over-the-counter options for heartburn fall into three tiers. Antacids neutralize acid that’s already in your stomach, providing the fastest relief but wearing off quickly. The next step up, H2 blockers, reduces acid production and provides relief for roughly eight hours. Proton pump inhibitors (PPIs) are the strongest option, reducing stomach acid for 15 to 21 hours per day, though they can take up to four days to reach full effect. PPIs work best for people whose heartburn is frequent and predictable rather than occasional.
Lifestyle changes often make as much difference as medication. Eating smaller meals, not lying down for two to three hours after eating, elevating the head of your bed by six inches, and losing weight if needed all reduce the mechanical forces that push acid upward. For many people, combining one or two targeted lifestyle changes with short-term medication is enough to break the cycle. If your symptoms persist despite these steps, further evaluation can check for structural issues like a hiatal hernia or assess whether the damage to your esophagus needs more direct treatment.