GERD and acid reflux are closely related but not the same thing. Acid reflux (also called gastroesophageal reflux, or GER) is what happens when stomach contents flow back up into your esophagus. It’s common and occasional. GERD, or gastroesophageal reflux disease, is the chronic, more severe form: acid reflux that keeps coming back and eventually causes symptoms or damage that won’t resolve on their own.
Think of it this way: acid reflux is the event, and GERD is what you’re diagnosed with when that event becomes a pattern. Roughly 14% of the global population lives with GERD, making it one of the most common digestive conditions worldwide.
What Separates Occasional Reflux From GERD
Almost everyone experiences acid reflux at some point. Eating a large meal, lying down too soon after eating, or having spicy food can all trigger a single episode. You feel a burning sensation behind your breastbone, maybe a sour taste in the back of your throat, and it passes. That’s normal GER.
GERD is diagnosed when reflux causes repeated symptoms or visible damage to the esophagus. There’s no single test that confirms it. Instead, doctors look at a combination of factors: your symptom history, how your esophagus looks during an endoscopy, whether acid exposure in your esophagus is abnormally high on monitoring tests, and whether your symptoms improve when you take acid-reducing medication. The classic symptoms are persistent heartburn and regurgitation. If you’ve dealt with both for more than five years, that’s a strong signal you may have GERD rather than occasional reflux.
Why the Valve Between Your Stomach and Esophagus Fails
At the junction where your esophagus meets your stomach sits a small band of muscle about 2 to 3 centimeters long. This muscle stays contracted at rest, creating a seal that keeps stomach acid where it belongs. Its resting pressure normally ranges between 10 and 30 mmHg. When you swallow, it relaxes briefly to let food through, then tightens again.
In people with GERD, the main problem isn’t usually that this muscle is permanently weak. Instead, it relaxes at the wrong times. These inappropriate relaxations are triggered primarily by stomach distension, especially after meals, through a nerve reflex involving the vagus nerve. Research shows that an increased frequency of these mistimed relaxations, rather than low baseline muscle pressure, is the primary cause of most reflux episodes.
A hiatal hernia can make things significantly worse. This occurs when part of the stomach pushes up through the opening in the diaphragm, disrupting the alignment between the esophageal muscle and the diaphragm that normally work together as a two-part seal. Once that alignment is lost, acid reflux becomes much more likely. The hernia can also trap refluxed material in a pocket above the diaphragm, prolonging the esophagus’s exposure to acid and bile. Each centimeter increase in hernia size raises the risk of poor esophageal movement by 30%, creating a cycle where the esophagus becomes less effective at clearing acid back down into the stomach.
How GERD Symptoms Feel
The hallmark symptoms are heartburn and regurgitation. Heartburn is a burning sensation that rises from your upper abdomen toward your chest and sometimes into your throat. Regurgitation feels like stomach contents or a bitter, sour liquid moving up into your throat or mouth without vomiting. These tend to worsen after meals, when bending over, or when lying down at night.
GERD can also cause symptoms you might not immediately connect to your stomach. A chronic cough, hoarseness in the morning, a feeling that something is stuck in your throat, and even dental erosion can all result from stomach acid repeatedly reaching the upper esophagus and throat. Some people experience chest pain that feels convincingly similar to heart-related pain, which is why unexplained chest pain sometimes leads to a reflux workup after cardiac causes are ruled out.
What Happens if GERD Goes Untreated
Chronic acid exposure damages the lining of the esophagus over time. The first stage is esophagitis, where the lining becomes inflamed, red, and sometimes eroded. If inflammation persists, scar tissue can form and narrow the esophagus (a stricture), making it progressively harder to swallow solid food.
The most concerning long-term complication is Barrett’s esophagus. This is a condition where the normal tissue lining the lower esophagus is replaced by tissue that more closely resembles the intestinal lining, a change driven by years of acid and bile exposure. Barrett’s esophagus carries an increased risk of esophageal cancer, though it’s important to know that most people with Barrett’s will never develop cancer. The risk is small. Still, if you’ve had reflux symptoms for more than five years, it’s worth discussing Barrett’s screening with your doctor, because the condition itself doesn’t always produce additional symptoms beyond what GERD already causes.
Lifestyle Changes That Actually Help
Weight loss is one of the most effective non-medication strategies for reducing GERD symptoms, and the data backs this up concretely. In one study of 167 participants, the percentage experiencing reflux symptoms dropped from 37% to 15% after six months of weight loss, with average BMI falling from about 35 to 30. Even modest weight loss helps: a separate trial found that losing around 11 kilograms (about 25 pounds) over 13 weeks measurably reduced the amount of time acid was present in the esophagus.
Elevating the head of your bed by about 6 to 8 inches (using a wedge or blocks under the bed frame, not just extra pillows) reduces nighttime acid exposure. One study showed supine acid exposure dropped from 21% to 15% of the night with this simple change. This works because gravity helps keep stomach contents in the stomach when your upper body is angled upward.
Other practical adjustments include avoiding eating within two to three hours of bedtime, eating smaller meals, and identifying personal trigger foods. Common triggers include fatty foods, chocolate, caffeine, alcohol, and tomato-based products, but triggers vary from person to person.
How GERD Is Treated With Medication
When lifestyle changes aren’t enough, acid-reducing medications are the standard approach. Two main categories exist, and they differ substantially in potency.
The first-line option for GERD is a class of drugs that block the acid-producing pumps in the stomach lining. These are the most powerful acid suppressors available. They keep stomach pH in a less acidic range for 15 to 22 hours per day. Doctors typically recommend an 8-week trial taken once daily before a meal, and if symptoms improve, that response itself helps confirm a GERD diagnosis.
A milder class of medications works by blocking one of the chemical signals that tells your stomach to produce acid. These are less potent, maintaining reduced acidity for only about 4 hours per day compared to the stronger option’s 15 to 22 hours. They can be useful for mild or intermittent symptoms, but for established GERD with esophageal inflammation, the stronger option heals tissue damage more reliably.
For people whose GERD doesn’t respond adequately to medication, or who prefer not to take medication long-term, surgical options exist that physically reinforce the barrier between the stomach and esophagus. These are typically reserved for cases where the diagnosis has been confirmed with objective testing and other approaches have fallen short.