Does COVID Make GERD Worse? How the Virus Affects Symptoms

COVID-19 can trigger new reflux symptoms and make existing GERD noticeably worse, both during the acute illness and for months afterward. Roughly a quarter to a third of people recovering from COVID report reflux-related complaints that were not part of their lives before infection, and the mechanisms behind this go well beyond a simple stomach bug. The virus targets the digestive tract directly, disrupts the esophageal lining, alters how the esophagus moves food, and sets off a cascade of immune and nervous system changes that collectively conspire to push acid where it does not belong.

Gut Symptoms During Acute COVID Are Strikingly Common

When people think of COVID-19, they picture a cough, fever, and loss of taste. But gastrointestinal symptoms have been a major feature of the illness since the early waves. In one survey of over 300 patients, about 87% developed new GI symptoms during their acute infection.¹ In a separate study of 405 confirmed patients, nearly half had GI complaints, and for many of them the gut symptoms appeared before any respiratory ones.² Diarrhea, nausea, and vomiting dominate the headlines, but reflux-type symptoms like heartburn and acid regurgitation are well-represented too. In the scoring-based survey, reflux syndrome ranked as the third most prominent GI pattern after abdominal pain and constipation in the post-acute period.¹

Why Your Digestive Tract Is a Prime Target

SARS-CoV-2 enters human cells by latching onto a protein called ACE2 on the cell surface. Your lungs have this protein, which is why the virus causes pneumonia. But your digestive organs actually have more of it. Gene-expression analyses have shown that digestive tract tissues express ACE2 at higher levels than lung tissue, and single-cell data confirms that the proportion of ACE2-positive cells in the gut significantly exceeds the proportion in the lung.³ This means the virus has plenty of entry points throughout the esophagus, stomach, and intestines. It is not merely hitching a ride through the gut; it is actively infecting the cells that line it.

This direct infection matters for GERD because the esophagus itself expresses ACE2. When the virus invades esophageal tissue, it can damage the mucosal lining and trigger local inflammation. Researchers have even found SARS-CoV-2 spike protein in esophageal biopsy specimens from patients who developed swallowing problems after their infection, confirming that the virus does not just pass through the digestive tract but can establish itself there.⁴

Reflux That Outlasts the Infection

For many people, reflux symptoms do not disappear when the fever breaks. About 29% of patients still have GI symptoms six months after recovering from COVID, and among those, roughly 27% specifically report reflux.⁵ An Indonesian survey of nearly 10,000 patients found that the rate of GERD was higher during the pandemic compared to the pre-pandemic period.⁵ These are not transient complaints. New-onset GERD symptoms following COVID have been documented to persist for over a year in some cases, suggesting that the virus can leave lasting changes in how the upper digestive tract functions.

The Esophageal Lining Takes a Hit

One of the clearest ways COVID worsens reflux is by damaging the esophageal barrier. Think of the esophageal lining as a wall of tightly packed cells that keeps stomach acid from seeping into the surrounding tissue. In post-COVID patients, that wall becomes leakier. Research measuring esophageal permeability found that biopsies from post-COVID patients showed roughly double the permeability of non-COVID patients when exposed to acidic conditions.⁶ These biopsies also showed elevated levels of an inflammatory marker called IL-8 and increased expression of Claudin-2, a protein associated with loosened junctions between cells.⁶

The practical result is that even normal amounts of acid exposure feel worse. When the barrier is compromised, acid that would barely register in a healthy esophagus can cause burning, discomfort, and irritation. This helps explain why some people develop heartburn after COVID even though their actual acid production has not necessarily increased.

How COVID Changes the Way Your Esophagus Moves

Beyond barrier damage, the virus also affects how the esophagus physically pushes food toward the stomach. A study of 84 patients who underwent esophageal manometry, a pressure-measurement test, both before and after COVID infection found significant changes in several motility parameters. The strength of esophageal contractions dropped, the speed at which the contractile wave traveled slowed, and the coordination of swallowing patterns worsened.⁷ Patients who already had esophageal motility problems before catching COVID saw those problems worsen further, a finding the researchers flagged as particularly concerning.⁷

Sluggish esophageal contractions matter for reflux because the esophagus relies on coordinated squeezing to clear acid that splashes up from the stomach. When those contractions are weaker or less organized, acid lingers longer in contact with the lining, prolonging the burn. If you had occasional heartburn before COVID that suddenly feels more persistent and intense, impaired clearance is a plausible culprit.

Gastroparesis and Delayed Stomach Emptying

The stomach itself can slow down after COVID, a condition known as gastroparesis. When the stomach takes too long to empty, food and acid sit around longer than they should. This creates upward pressure that pushes contents toward the esophagus, especially when you lie down or bend over. Case reports have documented post-viral gastroparesis following SARS-CoV-2 infection, with significant reductions in gastric emptying confirmed by testing.⁸ A systematic review of COVID-induced GI autonomic dysfunction identified gastric and duodenal dysfunction leading to obstructed gastric emptying as one mechanism contributing to acid reflux.⁹

The same review catalogued multiple overlapping mechanisms behind post-COVID reflux: increased serotonin levels that alter gut motility, cytokine-storm damage to the esophageal lining, and relaxation of the lower esophageal sphincter, the muscular valve meant to keep acid in the stomach.⁹ None of these mechanisms works in isolation; they compound each other.

Gut Microbiome Disruption Creates a Vicious Cycle

COVID-19 reshapes the bacterial community in your gut. The infection reduces the abundance of beneficial bacteria that have probiotic effects while creating conditions for more harmful species to thrive.¹⁰ This dysbiosis is not a trivial side effect. The resulting imbalance can amplify inflammation and oxidative stress, which in turn worsens the conditions that caused the imbalance in the first place.¹⁰

In people with long COVID specifically, the microbiome shifts in a characteristic pattern: bacteria that produce short-chain fatty acids, compounds that help maintain gut-lining integrity and reduce inflammation, become depleted. Meanwhile, opportunistic bacteria increase.¹¹ This shift contributes to a leakier gut overall, allowing bacterial products to enter the bloodstream and trigger systemic inflammatory responses. That inflammation can circle back to the upper digestive tract, aggravating esophageal sensitivity and worsening reflux symptoms in people who might not have had significant GERD beforehand.

Mast Cells and Lingering Immune Activation

One emerging explanation for why GERD persists long after the virus is gone centers on mast cells, immune cells scattered throughout the gut lining. In long COVID, these cells appear to remain in an activated state, releasing excessive inflammatory chemicals. Research has found elevated mast cell counts in intestinal tissue from long COVID patients, along with raised levels of tryptase (an enzyme mast cells release) and zonulin (a protein that loosens the junctions between gut-lining cells) in the bloodstream.¹² Spike protein was still detectable in intestinal tissue of these patients, suggesting that viral remnants may be driving the ongoing immune response.¹²

Activated mast cells dump histamine and other mediators that increase acid secretion, sensitize nerve endings, and promote tissue swelling. For the esophagus, this means you feel reflux more acutely and the tissue is slower to heal. The broader immune picture in long COVID includes T-cell depletion, innate immune cell hyperactivity, and elevated pro-inflammatory cytokines, all of which contribute to a state of chronic low-grade inflammation that keeps the digestive tract on edge.¹³

The Stress and Anxiety Factor

Not every worsening of GERD during and after COVID traces to the virus itself. The pandemic inflicted enormous psychological stress, and stress has well-documented effects on reflux. During psychological stress, the tight connections between cells in the esophageal lining weaken, reducing the barrier’s ability to resist acid damage. Anxiety can also lower a person’s pain threshold and heighten awareness of reflux episodes, making the same amount of acid feel significantly worse. There is a well-established link between anxiety severity and reflux symptom severity in GERD patients.¹⁴ Stress-related increases in snacking and eating throughout the day raise stomach pressure, which physically promotes reflux.¹⁴

Data from lockdown periods bears this out. A study of patients with functional GI disorders found that higher anxiety levels during lockdown were tied to worsening of specific upper-GI symptoms, including chest pain, waterbrash (that sour taste in the back of your throat), and burning in the upper stomach area.¹⁵ For someone trying to untangle whether their worsening heartburn is from COVID itself or from the stress of having been sick, the honest answer is that both paths feed into each other. Health-related anxiety can amplify the sensation of reflux, and actual tissue damage from the virus makes reflux genuinely worse, creating a feedback loop that is hard to break without addressing both sides.

A Complication for People Already on Acid-Suppressing Drugs

If you were managing GERD with a proton pump inhibitor before catching COVID, the relationship between your medication and the virus is worth understanding. A meta-analysis found that PPI use was associated with worse outcomes in COVID-19 patients, with a meaningfully higher risk of severe illness.¹⁶ A nationwide cohort study with propensity-score matching reported that current PPI use conferred a 79% greater risk of severe clinical outcomes from COVID, and PPI use that started within the prior 30 days was associated with a 90% increased risk.¹⁷

The suspected reason is that PPIs suppress stomach acid production, and stomach acid is one of your body’s defenses against ingested pathogens. With less acid, more virus may survive the trip through the stomach and reach the intestines, where ACE2 receptors are abundant. This does not mean you should stop your PPI without talking to your doctor, especially if your GERD is severe. But it does highlight an uncomfortable tension: the drug you take to control reflux may have made the viral infection more consequential, and the infection in turn may have made your reflux worse. Past PPI use, meaning use that stopped before COVID exposure, did not carry the same risk, which suggests that the timing of acid suppression relative to infection matters.¹⁷

Does the Variant Matter

The viral variant you caught may influence how much your gut is affected. A study focused on the Omicron variant found that about 31% of infected people experienced GI symptoms. Among those who already had pre-existing digestive problems, the rate was much higher, around 63%, compared to 25% in people without prior GI issues.¹⁸ The most common complaints were nausea, diarrhea, vomiting, and a feeling of fullness after eating. Upper GI symptoms, the category that includes reflux-type complaints like dysphagia and postprandial fullness, were more closely correlated with the severity of the overall infection, including the presence of pneumonia and need for hospitalization.¹⁸

If you already had GERD or another digestive condition before COVID, you were substantially more likely to develop GI symptoms during the infection. This makes intuitive sense: a digestive tract that was already somewhat compromised, with an irritated esophageal lining or a sluggish lower esophageal sphincter, has less reserve to cope with the additional insult of a viral infection. The combination of pre-existing vulnerability and viral damage tends to push people past the threshold where occasional heartburn becomes a daily problem.

When COVID Mimics or Masks Other Conditions

One clinical challenge with post-COVID reflux is distinguishing it from other conditions. Chest tightness and burning from esophageal inflammation can feel similar to cardiac symptoms, and persistent coughing from acid irritating the throat can be confused with lingering respiratory COVID. Some patients who develop difficulty swallowing after infection have been found to have a condition called achalasia, where the esophagus loses its ability to push food into the stomach properly. In at least one documented case, the SARS-CoV-2 spike protein was found directly in esophageal tissue from a patient who developed this swallowing disorder, suggesting the virus attacked the nerves controlling the esophagus.⁴

If you develop new or worsening reflux symptoms after COVID, especially if they do not respond well to the usual treatments like antacids or dietary changes, it is worth getting a proper workup. The underlying issue could be barrier damage that needs time to heal, a motility problem that standard acid-suppressing drugs do not address, or mast cell activation that responds better to antihistamines than to PPIs. The fact that multiple mechanisms can drive post-COVID reflux means that one-size-fits-all treatment often falls short, and understanding which mechanism is dominant in your case can make a real difference in how quickly symptoms improve.