GERD, or gastroesophageal reflux disease, is a chronic condition where acid from your stomach repeatedly flows backward into your esophagus, the tube connecting your mouth to your stomach. It affects roughly 825 million people worldwide and goes well beyond the occasional heartburn most people experience after a heavy meal. When reflux happens frequently, typically twice a week or more, the acid begins to irritate and damage the esophageal lining.
How the Stomach’s Valve Fails
At the bottom of your esophagus sits a ring of muscle called the lower esophageal sphincter (LES). This muscle stays contracted most of the time, creating a high-pressure seal that keeps stomach contents where they belong. It works together with a section of the diaphragm that wraps around it, and between these two structures, acid normally can’t travel upward.
In GERD, this barrier breaks down. The LES is smooth muscle controlled by nerves and hormones, which makes it vulnerable to relaxing at the wrong time. Sometimes it relaxes spontaneously when you’re not swallowing. Other times, specific substances weaken it directly: alcohol loosens the sphincter and irritates the esophageal lining, caffeine reduces its tone, and chocolate and mint can cause it to relax after a meal. High-fat and fried foods also trigger symptoms by slowing digestion and keeping the stomach fuller for longer.
Slow stomach emptying plays a role too. When food sits in the stomach longer than it should, the volume of material available to reflux increases. If pressure inside the stomach rises above the pressure the LES can maintain, the contents push through. This is why large meals and lying down shortly after eating are reliable triggers.
The Role of a Hiatal Hernia
A hiatal hernia occurs when the top of your stomach pushes up through an opening in the diaphragm into your chest. This displaces the junction where the esophagus meets the stomach, pulling it above the diaphragm. The muscles that normally help squeeze the esophagus shut can no longer tighten effectively in this position. Worse, the hernia traps a pocket of acid at the top of the stomach that can’t drain away. Not everyone with a hiatal hernia develops GERD, and not everyone with GERD has a hernia, but the two conditions overlap frequently and each makes the other harder to manage.
What GERD Feels Like
The most recognizable symptom is heartburn: a burning sensation behind the breastbone that often worsens after eating or when lying down. Some people feel it more as a burning stomach pain, closer to indigestion. But GERD has a wider range of symptoms than most people expect.
You may feel a persistent lump in your throat or have difficulty swallowing. Acid that reaches the throat, which tends to happen more at night, can cause hoarseness, a chronic cough, and swelling of the vocal cords. If tiny acid droplets reach your airways, they can trigger your bronchial tubes to contract, producing wheezing and shortness of breath that mimic asthma. Some people are treated for respiratory problems for months before anyone considers reflux as the underlying cause.
Symptoms are generally worse at night, after large or fatty meals, and in any position where gravity isn’t helping keep acid in the stomach.
How GERD Is Diagnosed
Many people are diagnosed based on their symptoms alone, especially if heartburn responds to acid-reducing medication. When the picture is less clear, or when symptoms persist despite treatment, doctors may use a 24-hour pH impedance test. This involves a thin, flexible tube inserted through the nose that extends to the stomach opening. The tube detects changes in acidity along its entire length and sends the data to a small recording device you wear on a belt. You go about your normal day for 24 hours, eating, drinking, and sleeping, while the device tracks every reflux episode. The test can distinguish between acid and non-acid reflux and measure exactly how much exposure your esophagus is getting.
An upper endoscopy, where a camera is passed down the throat, lets a doctor visually inspect the esophageal lining for inflammation, narrowing, or changes in the tissue that suggest long-term damage.
Complications of Long-Term Reflux
Chronic acid exposure can cause esophagitis, which is visible inflammation and erosion of the esophageal lining. Over time, the tissue may narrow from scarring, making swallowing progressively more difficult.
A more serious concern is Barrett’s esophagus, where the cells lining the lower esophagus change to resemble intestinal tissue in response to years of acid damage. Barrett’s itself doesn’t cause symptoms, but it increases the risk of esophageal cancer. Among people with Barrett’s who show no precancerous changes on biopsy, the annual risk of developing cancer is roughly 0.1% to 0.4%. That number climbs to about 1% per year when early precancerous changes are present, and above 5% per year when more advanced changes appear. These numbers are still relatively small on a year-to-year basis, but they add up over decades, which is why people with Barrett’s undergo regular monitoring.
Lifestyle Changes That Help
Because GERD involves a mechanical failure at the junction of the esophagus and stomach, some of the most effective interventions are physical. Elevating the head of your bed by six to eight inches (not just using extra pillows, which can bend you at the waist and worsen pressure) lets gravity work in your favor overnight. Avoiding meals for two to three hours before lying down gives your stomach time to empty.
Dietary adjustments target the sphincter directly. Cutting back on alcohol, caffeine, chocolate, and mint reduces the frequency of inappropriate sphincter relaxation. Smaller, lower-fat meals keep stomach volume and pressure down. Losing weight, if you’re carrying extra pounds around the midsection, reduces the mechanical pressure pushing against the LES from below. For many people with mild to moderate symptoms, these changes alone provide significant relief.
Medication Options
When lifestyle changes aren’t enough, medications reduce the amount of acid your stomach produces. Over-the-counter antacids neutralize acid that’s already present but don’t prevent it from being made, so their relief is temporary.
H2 blockers work by attaching to specific receptors on the acid-producing cells in your stomach, preventing those cells from receiving the chemical signal to release acid. They’re typically taken once at bedtime or twice daily, and they’re effective for mild to moderate symptoms.
Proton pump inhibitors (PPIs) are more powerful. They shut down the acid pumps in your stomach lining more completely and can be taken for longer periods. PPIs are the standard treatment for moderate to severe GERD and for healing esophageal inflammation. Most people notice improvement within a few days to a week.
When Surgery Becomes an Option
For people whose symptoms don’t respond adequately to medication, or who prefer not to take daily pills indefinitely, surgical options exist. The most established is fundoplication, where the top of the stomach is wrapped around the lower esophagus to reinforce the weakened sphincter. This is typically done laparoscopically and has a long track record.
A newer alternative is the LINX device, a small ring of magnetic beads placed around the LES. The magnets are strong enough to keep the sphincter closed against reflux but weak enough to open when you swallow. LINX is generally considered when medications haven’t helped or when a previous fundoplication wasn’t successful. Early studies are positive, though the procedure is still less studied than fundoplication. About 5% of patients have the device removed within seven years, most commonly because of difficulty swallowing.