GERD, or gastroesophageal reflux disease, is a chronic condition in which stomach contents repeatedly flow back into the esophagus, causing symptoms and sometimes damage to the esophageal lining. It affects roughly 10 to 20% of adults in Western countries, and globally the number of people living with GERD nearly doubled between 1990 and 2021, reaching over 825 million cases.
How GERD Differs From Occasional Heartburn
Almost everyone experiences acid reflux at some point. A heavy meal, lying down too soon after eating, or a spicy dish can all trigger a brief episode. GERD is different because the reflux is persistent and frequent enough to cause ongoing symptoms or complications in the esophagus. The two hallmark symptoms are heartburn, a burning sensation behind the breastbone that rises toward the throat, and regurgitation, the effortless return of stomach contents into the mouth, often with a bitter or sour taste.
Some people with GERD also experience chest pain, difficulty swallowing, a chronic cough, hoarseness, or the feeling of a lump in the throat. These “atypical” symptoms can make GERD tricky to recognize because they overlap with other conditions like asthma or heart disease.
What Happens Inside the Esophagus
At the bottom of your esophagus sits a ring of muscle called the lower esophageal sphincter. It opens to let food into the stomach and then closes to keep stomach acid where it belongs. In people with GERD, this sphincter relaxes at the wrong times. These inappropriate relaxations are the single most common mechanism behind reflux in both healthy individuals and those with GERD. Each time the sphincter opens when it shouldn’t, stomach acid, digestive enzymes, and bile can wash upward into the esophagus, which lacks the protective lining the stomach has.
A hiatal hernia, where the upper part of the stomach pushes through the diaphragm, makes things worse in two ways. It disrupts the normal support the diaphragm provides to the sphincter, and the herniated portion of the stomach acts as a reservoir that traps acid and allows it to reflux more easily when you swallow. Conditions that increase pressure inside the abdomen, such as pregnancy or obesity, also push more acid upward and intensify symptoms.
How GERD Is Diagnosed
Most people with classic heartburn and regurgitation don’t need any testing. The standard approach is to treat those symptoms with an eight-week trial of acid-suppressing medication taken once daily before a meal. If symptoms improve, the diagnosis is essentially confirmed.
When symptoms don’t respond to treatment, or when something more serious might be going on, doctors turn to more specific tools. The gold standard test is ambulatory pH monitoring, where a tiny sensor (either a wireless capsule or a thin probe) measures acid levels in the esophagus over 24 to 48 hours. This captures exactly when reflux happens and whether your symptoms line up with those episodes. An upper endoscopy, where a flexible camera is passed into the esophagus, lets doctors look directly at the tissue for signs of inflammation, narrowing, or precancerous changes.
Symptoms That Need Prompt Evaluation
Certain symptoms alongside reflux suggest something more serious may be developing. Difficulty swallowing or pain when swallowing can indicate a narrowed esophagus, ulceration, or in rare cases a malignancy. Unexplained weight loss, signs of bleeding (such as vomiting blood or dark stools), and anemia are also red flags. These “alarm” symptoms typically prompt an endoscopy rather than a wait-and-see medication trial. People over 50 with chronic reflux symptoms, particularly those who are male, white, or carry excess weight around the midsection, are also at higher risk for complications and may benefit from screening.
Long-Term Complications
Chronic acid exposure can gradually change the cells lining the lower esophagus, a condition called Barrett’s esophagus. Barrett’s itself doesn’t cause noticeable symptoms, but it’s significant because the altered cells carry a small risk of progressing to esophageal cancer. In people with Barrett’s who show no precancerous changes on biopsy, the annual cancer risk is roughly 0.12% to 0.40%. That risk climbs to around 1% per year if early precancerous changes (low-grade dysplasia) are present, and exceeds 5% per year with more advanced changes.
Other complications of untreated GERD include esophageal strictures, where scar tissue narrows the esophagus and makes swallowing progressively harder, and esophageal ulcers, which can bleed and cause pain.
Lifestyle Changes That Actually Help
Not all commonly repeated lifestyle advice for GERD holds up equally well in clinical studies, but a few changes have solid evidence behind them.
Elevate the head of your bed. Using a 10-inch wedge under the head of the bed (not just extra pillows, which bend you at the waist) reduced acid exposure in the esophagus during sleep from 21% of the night to 15% in a controlled trial. Gravity helps keep acid in the stomach when your upper body is angled upward.
Don’t eat close to bedtime. Eating two hours before bed versus six hours before bed made a dramatic difference in nighttime reflux in one trial, and the risk of GERD is more than seven times higher in people who routinely eat within three hours of lying down. The American College of Gastroenterology recommends finishing your last meal at least two to three hours before bed.
Lose weight if you carry extra. Excess abdominal weight increases pressure on the stomach and sphincter. Weight loss is one of the most consistently supported interventions for reducing GERD symptoms.
Eating habits matter beyond what you eat. Eating very quickly raises GERD risk roughly fourfold, and regularly eating past the point of fullness nearly triples it. Late-night snacking carries a fivefold increase in risk. A high-fat diet is one of the strongest dietary risk factors, associated with more than a sevenfold increase. Spicy food is also positively linked to reflux symptoms. Interestingly, plant-heavy diets appear to be protective, while daily meat and high-protein intake are associated with slightly higher risk.
Medication Options
Two main classes of medication target GERD by reducing the amount of acid your stomach produces, but they work differently and aren’t equally effective.
H2 blockers (like famotidine) reduce acid by blocking one of the signals that tells your stomach to produce it. They work reasonably well for mild, occasional symptoms but struggle to control acid production after meals, which is when reflux tends to be worst.
Proton pump inhibitors, commonly called PPIs, block the final step of acid production regardless of what triggered it. This makes them far more effective. In head-to-head comparisons, PPIs healed esophageal damage at roughly twice the rate of H2 blockers at every time point measured. The amount of healing PPIs achieved in just two weeks was greater than what H2 blockers accomplished in eight weeks. PPIs are the first-line treatment for GERD, typically taken once daily before breakfast for eight weeks as an initial course.
When Surgery Becomes an Option
Surgery is reserved for people with GERD that doesn’t respond adequately to medication or who prefer not to take daily pills long-term. The gold standard procedure is the Nissen fundoplication, where the top of the stomach is wrapped around the lower esophagus to reinforce the weakened sphincter. It’s effective, but the wrap can make it difficult to belch or vomit afterward, and bloating is a common side effect.
A newer alternative is magnetic sphincter augmentation, where a small ring of magnetic beads is placed around the sphincter. The magnets are strong enough to keep the sphincter closed against reflux but separate easily when you swallow. In comparative studies, both procedures eliminated the need for daily medication in about 81% of patients. The magnetic device performed significantly better at preserving the ability to belch (95% vs. 66%) and vomit (94% vs. 50%), which matters more than it might sound, since the inability to release gas or vomit when needed can be genuinely uncomfortable. Rates of post-surgical swallowing difficulty and bloating were similar between the two approaches.