Acid reflux becomes more common with age because of a combination of physical changes: the esophagus loses its ability to clear acid efficiently, the stomach empties more slowly, hernias become increasingly prevalent, and the medications older adults take for other conditions often make things worse. Unlike reflux in younger people, which tends to cause obvious heartburn, reflux in older adults can be subtler and more damaging because it often goes unnoticed for longer.
The Esophagus Clears Acid Less Effectively
When you swallow food or liquid, your esophagus uses wave-like muscle contractions called peristalsis to push everything down into the stomach. These contractions also serve as a cleanup mechanism, sweeping any acid that splashes upward back down where it belongs. With age, this cleanup system weakens significantly.
There are two types of these contractions. Primary peristalsis happens when you swallow. Secondary peristalsis kicks in automatically when acid touches the esophageal lining, acting as a reflexive defense. Research using specialized testing found that among people with normal swallowing function, only 12% of those under 40 had problems with secondary peristalsis. That number jumped to 51% in people over 60. This means the automatic acid-clearing reflex deteriorates faster than regular swallowing does, leaving the esophagus exposed to acid for longer periods between meals and especially overnight.
Saliva also plays a protective role. It contains bicarbonate, a natural acid neutralizer, and every time you swallow saliva, it helps wash acid back down. Saliva production decreases slightly with age, but the more important change is that the bicarbonate response to acid in the esophagus becomes significantly weaker. So even when saliva is present, it’s less effective at neutralizing what it encounters.
Hiatal Hernias Become Extremely Common
A hiatal hernia occurs when the upper part of the stomach pushes up through the diaphragm, the muscle that separates the chest from the abdomen. This displacement disrupts the natural barrier that helps keep stomach acid where it belongs. The diaphragm normally pinches around the base of the esophagus, reinforcing the valve between the esophagus and stomach. When a hernia develops, that reinforcement is lost.
The prevalence of hiatal hernias climbs steeply with age: roughly 50% of people over 50 have one, 60% of those over 60, and 70% of those over 70, according to Cleveland Clinic data. Many of these hernias are small and cause no symptoms on their own, but they create the structural conditions that make reflux more likely, especially when combined with the motility changes described above.
The Stomach Empties More Slowly
The longer food sits in the stomach, the more opportunity there is for acid to splash back up into the esophagus. Gastric emptying slows measurably with age. In one study comparing healthy younger and older adults, the time to fully empty the stomach after a solid meal averaged about 245 minutes in younger subjects and 335 minutes in older ones, a difference of roughly an hour and a half. This delay is thought to result from gradual nerve dysfunction affecting the autonomic signals that control stomach contractions.
Slower emptying means the stomach stays full and distended for longer after eating, which increases pressure on the valve at the top of the stomach and makes reflux episodes more frequent.
Medications That Worsen Reflux
Older adults take more medications than any other age group, and several common drug classes directly promote reflux. Some relax the muscular valve between the esophagus and stomach, making it easier for acid to escape. Others irritate the esophageal lining, amplifying the damage acid causes.
- NSAIDs and aspirin: Anti-inflammatory painkillers like ibuprofen and naproxen are strongly associated with reflux. Aspirin increases the risk further, especially when combined with other NSAIDs.
- Calcium channel blockers and nitrates: Both are widely prescribed for high blood pressure and heart conditions. Both relax smooth muscle throughout the body, including the valve at the top of the stomach.
- Benzodiazepines: Sedatives prescribed for anxiety or sleep also relax that valve.
- Tricyclic antidepressants: An older class of antidepressants that slows digestive motility and reduces valve pressure.
- Anticholinergic drugs: Found in many medications for overactive bladder, allergies, and other conditions. These reduce digestive muscle contractions and increase the number of reflux episodes.
- Hormone replacement therapy: Estrogen-based HRT has been identified as a risk factor for developing reflux.
Because many older adults take several of these simultaneously, the combined effect can be substantial. If reflux symptoms appear or worsen after starting a new medication, the timing is worth noting.
Changes at the Valve Itself
The lower esophageal sphincter, the ring of muscle where the esophagus meets the stomach, behaves differently in older adults, though not always in the way you might expect. Rather than simply becoming weak and floppy, the sphincter in older patients often has higher resting pressure than in younger people. The problem is that it doesn’t relax properly when you swallow. Studies of older patients show incomplete relaxation with a shorter window of opening, meaning the valve is both stiffer and less coordinated.
This matters because a valve that doesn’t open fully during swallowing can trap material above it, and one that doesn’t coordinate well with the esophageal contractions above it creates opportunities for acid to move in the wrong direction during those brief moments of opening.
Why Symptoms Can Be Harder to Recognize
One of the more concerning aspects of reflux in older adults is that it frequently shows up without the classic burning sensation in the chest. Acid can reach the throat, voice box, and airways without causing noticeable heartburn. When reflux triggers a chronic cough, digestive symptoms are absent up to 75% of the time. This “silent reflux” means many older adults don’t realize acid is causing their symptoms.
Two pathways explain how reflux causes problems beyond the esophagus. The first is direct contact: tiny amounts of stomach acid reach the throat or are inhaled into the airways, irritating tissue and triggering cough, hoarseness, or wheezing. The second is indirect: acid in the lower esophagus stimulates nerve pathways that cause coughing or airway tightening even when the acid never reaches the throat. Both mechanisms are more active during sleep, when the body’s normal protective reflexes are suppressed. Lying flat also removes gravity as a barrier, making nighttime reflux particularly common and damaging in older adults.
Laryngeal problems related to reflux are associated with older age, longer duration of reflux, and obesity. In one large study, about 10% of reflux patients had laryngeal involvement.
Complications Build Over Time
Because reflux in older adults is often longstanding by the time it’s identified, the risk of complications is higher. The most significant is Barrett’s esophagus, a condition where the lining of the lower esophagus changes in response to chronic acid exposure. Among white men with reflux symptoms, the detection rate of Barrett’s rises sharply from about 2% in the 30s to roughly 9% by the 50s and 60s, then plateaus. Among women with reflux, the rate is around 2.4% between ages 40 and 79. Barrett’s esophagus matters because it’s a precursor to esophageal cancer, making it the primary reason long-term reflux warrants evaluation rather than just symptom management.
Risks of Long-Term Acid Suppressants
Proton pump inhibitors (PPIs) are the most effective medications for controlling acid reflux, but they carry specific risks for older adults on long-term therapy. By powerfully reducing stomach acid, they can impair absorption of several nutrients that are already harder to maintain in aging bodies.
Vitamin B12 absorption depends on stomach acid, and prolonged PPI use has been linked to B12 deficiency, which can contribute to fatigue, nerve problems, and cognitive changes. Calcium absorption also decreases, raising concerns about bone density. The 2023 Beers criteria, a widely used guide for medication safety in older adults, flags PPIs for their association with bone fractures, a serious concern given how common osteoporosis already is in this population. The risk increases with higher doses, use beyond one year, and when combined with corticosteroids or certain other medications.
PPIs have also been associated with increased risk of gut infections, pneumonia, and deficiencies in magnesium, iron, and vitamin D. None of this means PPIs should be avoided when genuinely needed, but it does mean that older adults on these medications benefit from periodic reassessment of whether the dose and duration are still appropriate.