GERD, or gastroesophageal reflux disease, is a chronic condition where stomach contents repeatedly flow back into the esophagus, causing tissue irritation and symptoms like heartburn. It affects roughly 10 to 20% of adults in Western countries, with over 825 million cases worldwide as of 2021. While almost everyone experiences occasional acid reflux, GERD is the diagnosis when it becomes frequent, typically more than twice a week, and starts affecting daily life.
Acid Reflux, Heartburn, and GERD
These three terms get used interchangeably, but they describe different things. Acid reflux is the physical event: stomach contents travel backward through the esophagus toward the throat. Heartburn is the sensation that event produces, a burning feeling behind the breastbone, in the neck, or throat. GERD is the disease that develops when acid reflux happens frequently enough to irritate or damage the esophageal lining.
Everyone has occasional acid reflux. Eating a large meal, lying down too soon afterward, or having certain trigger foods can cause a single episode. That’s normal. GERD is what happens when the mechanism meant to prevent backflow stops working reliably.
Why the Valve Stops Working
At the bottom of your esophagus, a ring of muscle called the lower esophageal sphincter (LES) acts as a one-way gate. It opens to let food into the stomach, then closes to keep it there. In people with GERD, this gate either stays too relaxed or opens at the wrong times.
The most common culprit isn’t a permanently weak sphincter. Instead, it’s an increased frequency of what researchers call transient relaxations. After a meal, your stomach stretches, and a nerve reflex temporarily opens the sphincter to vent gas. This is normal and happens to everyone. In people with GERD, these relaxations happen more often than they should and allow acid to escape along with the gas. The reflex is triggered by stomach distension, which is why large meals and carbonated drinks tend to make things worse.
Persistent low sphincter pressure, where the muscle is essentially always loose, is actually uncommon. It’s mainly seen in people with certain connective tissue diseases or those who’ve had prior esophageal surgery.
Common Symptoms
The hallmark symptoms are heartburn and regurgitation, the sensation of acid or food rising into the throat. About 7% of the US population experiences these daily, and up to 40% experience them monthly.
But GERD doesn’t always feel like what you’d expect. A significant number of people never have classic heartburn and instead develop symptoms that seem unrelated to their stomach. These include a chronic cough that won’t go away, hoarseness, frequent throat clearing, a persistent sore throat, or a sensation of a lump in the throat. Chronic cough can actually be the only sign of GERD in more than half of affected patients, with no heartburn at all. GERD-related cough tends to occur during the day and while upright, and it’s usually dry and long-standing.
Chest pain from GERD can also mimic heart-related pain closely enough that it sends people to the emergency room. Among people with asthma, 50 to 80% also have GERD, and reflux can worsen airway symptoms. Notably, classic reflux symptoms are absent in 40 to 60% of asthmatics whose reflux is contributing to their breathing problems.
Risk Factors
Excess weight is one of the strongest risk factors. Extra abdominal fat increases pressure on the stomach, which pushes contents upward. Pregnancy carries a similar mechanism: the growing uterus compresses the stomach, and hormonal changes relax the esophageal sphincter. The more weight gained during pregnancy, the higher the risk. Maternal age also plays a role.
Other factors that contribute include smoking, eating large or late meals, consuming high-fat or acidic foods, and drinking alcohol or coffee. Certain medications can relax the sphincter or irritate the esophageal lining, including some blood pressure drugs, sedatives, and anti-inflammatory painkillers. Having a hiatal hernia, where part of the stomach slides above the diaphragm, also disrupts the anti-reflux barrier.
How GERD Is Diagnosed
Many people are diagnosed based on symptoms alone, especially if heartburn and regurgitation respond to acid-reducing medication. When symptoms are unclear or don’t respond to treatment, doctors use more definitive testing.
An upper endoscopy lets a doctor visually inspect the esophagus. Finding moderate to severe erosive damage (graded as LA class C or D), Barrett’s esophagus (a precancerous tissue change), or a narrowing of the esophagus from scarring is considered conclusive evidence of GERD. However, a normal-looking esophagus doesn’t rule it out. Up to 70% of people with reflux symptoms have no visible damage on endoscopy.
For those cases, pH monitoring provides more clarity. A small probe placed in the esophagus measures acid exposure over 24 hours. Under the Lyon Consensus, the current diagnostic framework, acid exposure time above 6% of the monitoring period is definitively abnormal, below 4% is normal, and anything in between is inconclusive. More than 80 reflux episodes in 24 hours is also considered definitively abnormal.
Lifestyle Changes That Help
Several practical adjustments have good evidence behind them. Elevating the head of your bed by about 10 inches using a wedge (not just extra pillows, which can bend you at the waist and worsen pressure) reduced acid exposure time from 21% to 15% in a controlled trial of GERD patients. The goal is to let gravity keep stomach contents where they belong while you sleep.
Meal timing matters significantly. A study comparing a late meal eaten 2 hours before bedtime versus an early meal eaten 6 hours before bedtime found substantially more nighttime reflux after the late meal. Giving your stomach at least 3 hours to empty before lying down is a practical middle ground. Eating smaller meals reduces stomach distension, which directly reduces those problematic sphincter relaxations. Weight loss, when applicable, is one of the most effective long-term strategies because it reduces the mechanical pressure driving reflux.
Medication Options
The two main categories of medication are H2 receptor antagonists and proton pump inhibitors (PPIs). Both reduce the amount of acid your stomach produces, but they work differently and suit different situations.
H2 blockers work faster and are a reasonable choice for people with intermittent symptoms who need quick, occasional relief. Their effectiveness tends to diminish over time with regular use. PPIs are more potent and more effective for sustained symptom control, particularly for people who need daily treatment. In head-to-head comparisons, PPIs consistently outperform H2 blockers for heartburn relief, though the gap narrows for people with milder disease.
A practical approach: if your symptoms are occasional and predictable, an H2 blocker taken as needed may be sufficient. If you’re dealing with daily symptoms or have esophageal damage, a PPI taken regularly provides more reliable control. PPIs are typically taken 30 to 60 minutes before a meal for best absorption.
When Surgery Makes Sense
Surgery becomes a consideration when medications don’t control symptoms adequately, when side effects make long-term medication use impractical, or when regurgitation persists despite acid suppression (since medications reduce acid but don’t stop the physical backflow).
The most established procedure is fundoplication, where the top of the stomach is wrapped around the lower esophagus to reinforce the sphincter. A newer option is magnetic sphincter augmentation, which places a ring of small magnetic beads around the sphincter to help it stay closed between swallows while still allowing food to pass. Candidacy for the magnetic device largely mirrors that for fundoplication, though it requires normal esophageal muscle function and is not suitable for people with certain metal allergies or those who need frequent MRI scans.
Long-Term Complications
Left unmanaged over years, chronic acid exposure can cause progressive damage. Erosive esophagitis (visible inflammation and ulceration) can lead to scarring that narrows the esophagus, making swallowing difficult. The more concerning long-term risk is Barrett’s esophagus, where the normal esophageal lining is replaced by tissue that resembles the intestinal lining. Barrett’s is a precancerous condition.
Among people with GERD, about 3% develop Barrett’s esophagus. That number climbs to over 12% when GERD is combined with other risk factors like obesity, age over 50, or male sex. Barrett’s itself progresses to esophageal cancer at a low annual rate, but the progression follows a defined path from mild cellular changes to more severe changes and eventually cancer. This is why people diagnosed with Barrett’s undergo regular surveillance endoscopies to catch any progression early, when it’s most treatable.