Heartburn and acid reflux are closely related but not the same thing. Acid reflux is the physical event: stomach contents flow backward into the esophagus. Heartburn is the burning sensation you feel when that happens. In other words, acid reflux is what your body does, and heartburn is what you feel because of it.
How Acid Reflux Causes Heartburn
At the bottom of your esophagus sits a ring of muscle that acts like a one-way valve. It opens to let food into your stomach and closes to keep everything down. When this valve relaxes at the wrong time or doesn’t close tightly enough, stomach acid slips back up into the esophagus. That’s acid reflux.
The lining of your esophagus isn’t built to handle stomach acid the way your stomach lining is. When acid makes contact, it irritates the tissue and produces that familiar burning feeling behind your breastbone, in your neck, or in your throat. That sensation is heartburn. You can have acid reflux without noticing heartburn, and heartburn is not the only symptom reflux can cause, but the two are so tightly linked that people often use the terms interchangeably.
Symptoms Beyond the Burn
Heartburn is the most recognized symptom of acid reflux, but it’s far from the only one. Reflux can also cause regurgitation (a sour or bitter taste when stomach contents reach the back of your throat), difficulty swallowing, and a feeling like food is stuck in your chest.
There’s also a longer list of less obvious symptoms that most people wouldn’t connect to reflux at all. A chronic cough that lingers during the day and doesn’t produce mucus is one of the three most common causes of persistent cough, and reflux is behind it more than half the time. Hoarseness, frequent throat clearing, a sore or burning throat, and a sensation of a lump in the throat (which tends to be worse between meals) can all trace back to acid reaching the upper throat. Among people with chronic laryngitis or hard-to-treat sore throats, up to 60% have reflux as the underlying cause. Between 50% and 80% of people with asthma also have reflux, and acid irritating the lower esophagus can trigger airway tightening even without acid reaching the lungs directly.
Chest pain that mimics heart problems is another atypical presentation. Acid stimulating nerve receptors in the lower esophagus can produce pain that feels cardiac in nature, which is why reflux is a leading cause of non-cardiac chest pain.
Silent Reflux: No Heartburn at All
Some people have acid reflux that travels past the esophagus and into the throat and voice box, a condition called laryngopharyngeal reflux. Because it bypasses the lower esophagus where heartburn typically registers, it often produces no burning sensation at all. Instead, the main complaints are voice changes, a persistent need to clear the throat, postnasal drip, and sinus irritation. This is why it’s commonly called “silent reflux.” It happens when a second muscular valve at the top of the esophagus also fails to close properly, letting acid that’s already escaped the stomach creep even higher. Silent reflux often involves only small amounts of acid, which means it’s more likely than typical reflux to improve with lifestyle changes alone.
When Reflux Becomes GERD
Everyone experiences acid reflux occasionally. A large meal, lying down too soon after eating, or certain foods can trigger a one-off episode. That’s normal. GERD, or gastroesophageal reflux disease, is the diagnosis when reflux becomes chronic, producing ongoing symptoms or damaging the esophageal lining. It affects roughly 10% to 20% of adults in Western countries, with rates rising globally. The number of people living with GERD worldwide nearly doubled between 1990 and 2021, reaching over 825 million cases.
There’s no single number of episodes per week that automatically qualifies as GERD. Doctors typically diagnose it based on the pattern and persistence of symptoms combined with how well you respond to acid-reducing medication over an 8 to 12 week trial. If symptoms keep returning or worsen, further evaluation may follow.
What Causes the Valve to Fail
The muscular valve at the base of the esophagus can malfunction in two main ways. The more common problem is that it relaxes spontaneously when it shouldn’t, opening briefly and letting acid escape. The second pattern is chronically weak resting pressure in the valve, meaning it never fully seals. Both patterns appear to stem primarily from faulty nerve signaling to the muscle rather than a structural defect in the muscle itself. A hiatal hernia, where part of the stomach pushes up through the diaphragm, can also impair the valve’s ability to stay closed, particularly during physical strain or bending over.
What Happens if Reflux Continues Long-Term
Chronic acid exposure changes the cells lining the lower esophagus. In about 3% of people with GERD, these cells transform into a different type of tissue, a condition called Barrett’s esophagus. Barrett’s itself doesn’t cause noticeable symptoms beyond the reflux you already have, but it’s significant because it’s a precursor to esophageal cancer. The actual cancer risk is low: for people with Barrett’s and no abnormal cell changes, the progression rate is 0.1% to 0.33% per year. That risk climbs with increasing cellular abnormality, reaching about 7% per year in the most advanced precancerous stage. The vast majority of people with occasional reflux will never develop Barrett’s, but persistent, untreated reflux over many years does raise the likelihood.
Relief Options and How Quickly They Work
Over-the-counter options for reflux fall into three categories, and they work on different timelines. Antacids (the chewable tablets or liquids) neutralize acid that’s already in your stomach. They work within minutes but wear off quickly, making them best for occasional flare-ups after a meal.
H2 blockers reduce the amount of acid your stomach produces. They take longer to kick in than antacids but last around four hours, making them useful if you know a triggering meal or bedtime is coming.
Proton pump inhibitors are the strongest acid suppressors available without a prescription. They block the acid-producing pump in your stomach cells directly and can keep stomach acid levels low for 15 to 22 hours per day, compared to about four hours for H2 blockers. The tradeoff is that they take a day or more to reach full effect and work best when taken consistently before your first meal. They’re designed for frequent reflux rather than the occasional episode.
Lifestyle changes work alongside any of these. Eating smaller meals, staying upright for two to three hours after eating, elevating the head of your bed, and identifying your personal trigger foods (common ones include fatty or fried foods, tomato-based dishes, chocolate, coffee, and alcohol) can reduce how often reflux happens in the first place.