GERD shows up in PTSD veterans at rates well above the civilian baseline. It's one of the most commonly filed secondary chains in the system. Most get denied at the regional office level, then quietly granted years later at the Board after a private nexus letter shows up.

That gap, between solid medical science and weak claim outcomes, is what I want to walk through. I pulled together what the published research actually says about chronic stress and the upper GI tract, what 38 CFR § 3.310 requires for a secondary claim, what the Board has done when these cases come up on appeal, and what the difference looks like between a nexus opinion that wins and one that gets dismissed. GERD secondary to PTSD is one of the cleaner secondary chains in the system on the medical side. It's also one of the most consistently mishandled at the C&P level. I'll get into why both of those things are true.

TL;DR

  • GERD secondary to PTSD has three documented medical pathways in the published literature: chronic stress and cortisol elevation driving gastric acid hypersecretion, psychiatric medications causing direct GI side effects, and autonomic dysfunction affecting the lower esophageal sphincter.
  • The chain is governed by 38 CFR § 3.310, and both causation and aggravation are valid theories under Allen v. Brown.
  • In Claim Raven's analysis of 2,248 GERD cases at the BVA, grants run at 36.7 percent, denials at 37.4 percent, and remands at 25.9 percent. GERD-secondary-to-PTSD isn't a separately tagged subset in our aggregates, but the broader GERD pattern is consistent: strong nexus opinions grant at 64.6 percent across 359 cases, adequate at 74.0 percent across 300 cases, and weak at 10.9 percent across 238 cases.
  • Most denials I've seen turn on weak C&P opinions that don't address the medication pathway, or that default to H. pylori or diet as alternative explanations without explaining why PTSD couldn't have driven the same symptoms.
  • GERD rates 0, 10, 30, or 60 percent under 38 CFR § 4.114 DC 7346. A 30 percent GERD rating combined with 70 percent PTSD lands at 79 on the combined ratings table, which rounds to 80.

The Regulatory Framework: 38 CFR § 3.310 and the Allen v. Brown Aggravation Theory

Causation vs aggravation

Secondary service connection lives under 38 CFR § 3.310. The regulation does two things. First, it allows service connection for a disability that is "proximately due to or the result of a service-connected disease or injury." That's causation. Second, after the Federal Circuit's decision in Allen v. Brown (7 Vet. App. 439, 1995), the regulation also recognizes aggravation, where a non-service-connected condition is made measurably worse by a service-connected one.

This matters more than it sounds. For causation, the veteran has to show the primary condition caused the secondary. For aggravation, the veteran only has to show the primary condition made the secondary worse than its natural progression. Either theory carries the claim.

How this applies to GERD claims

For GERD secondary to PTSD specifically, both theories tend to be in play. The Board has recognized that PTSD can directly cause GERD through the physiological pathways I'll get into below. It has also granted on aggravation theory, where a veteran had mild reflux that became severe and chronic after PTSD onset and PTSD medication. The legal framework supports both. The problem, as usual, is that the medical opinion attached to the claim often doesn't do the work the framework requires.

Pathway One: Chronic Stress, Cortisol, and Gastric Acid Hypersecretion

This is the most direct of the three pathways and the one with the longest research history. PTSD is, at the physiological level, a disorder of chronic stress response. The HPA axis runs in a sustained activated state. Cortisol elevation, sympathetic overactivity, and inflammatory markers all show up at higher than baseline rates in PTSD populations.

Cortisol and chronic stress have well-documented effects on the upper GI tract. Stress increases gastric acid secretion. It slows gastric emptying. It changes how the lower esophageal sphincter responds to gastric pressure. Researchers have documented these effects going back decades.

Mysliwiec and colleagues, in their work on somatic symptoms in military populations with PTSD, found GI symptom prevalence well above the civilian baseline. The pattern included reflux, dyspepsia, and functional GI complaints clustering in veterans with PTSD even after controlling for medication and dietary factors. That's the empirical fingerprint of a real causal relationship.

The fact that two conditions co-occur at higher rates doesn't prove causation in any single case. What it does is establish medical plausibility, which is what 38 CFR § 3.310 actually requires. The nexus letter doesn't have to prove the veteran's specific GERD was caused by their specific PTSD. It has to show the proposition is at least as likely as not.

Pathway Two: PTSD Medications and Direct GI Side Effects

This is the pathway that gets the most attention in the published literature, and honestly the one that's most often missed in C&P opinions.

The chain is mechanical and well-documented. Veterans with PTSD get prescribed SSRIs (sertraline, paroxetine, fluoxetine, citalopram), SNRIs (venlafaxine, duloxetine), benzodiazepines (clonazepam, lorazepam, diazepam), and frequently NSAIDs or aspirin for the chronic pain conditions that ride along with PTSD. Every one of these drug classes has documented GI side effects.

SSRIs cause GI symptoms in a substantial portion of patients. The mechanism involves serotonin receptors in the gut, which the medication targets directly. Nausea, dyspepsia, and reflux symptoms are listed in the prescribing information for every SSRI in common use. The published literature on SSRI-associated GI symptoms is extensive.

Benzodiazepines, especially used long-term, reduce lower esophageal sphincter tone. That's a direct mechanical contributor to reflux. NSAIDs damage the gastric mucosa and are one of the most common causes of medication-induced GERD in any population. Aspirin does the same thing.

Here's where claims fall apart. The C&P examiner sees a veteran with GERD and writes an opinion that says, in effect, "the GERD is more likely due to dietary factors or H. pylori than PTSD." Which can be a true statement about an immediate cause. But it skips the upstream link entirely. If the veteran's NSAID use is driven by service-connected pain, or the SSRI use is required for the service-connected PTSD, the medication effect is part of the secondary chain. The Board has been clear on this point. A medical opinion that names diet or H. pylori without addressing why the veteran is on the medications causing the same symptoms is incomplete.

The legally relevant question, under 38 CFR § 3.310, is whether the service-connected condition (PTSD) is proximately due to or the result of the GERD, including via an intermediate step like medication. The Federal Circuit and the CAVC have both held that intermediate causal steps don't break the chain.

Pathway Three: Autonomic Dysregulation and Esophageal Sphincter Dysfunction

This one's the least often invoked and probably the most underappreciated. PTSD is associated with measurable autonomic nervous system dysregulation. Sympathetic activity runs high, parasympathetic tone is reduced, and over time this affects pretty much every organ system that the autonomic nervous system regulates. That includes the GI tract.

Research on autonomic function in PTSD populations has documented changes in gastric motility, lower esophageal sphincter pressure, and esophageal clearance. The sphincter that's supposed to keep stomach acid out of the esophagus relies on coordinated autonomic input. When that input is dysregulated, the sphincter doesn't perform its function reliably. Reflux follows.

This pathway doesn't usually carry cases by itself. The literature is thinner than for the cortisol or medication pathways, and the mechanism is less intuitive to a C&P examiner who isn't a GI specialist. But the strongest nexus letters I've seen in this space tend to layer multiple pathways. An opinion that says "chronic stress effects plus medication side effects plus autonomic dysfunction together explain the GERD" is much harder for the Board to dismiss than one that hangs on a single mechanism.

The Typical Claim Pattern, and Why It Usually Fails

Here's how these cases tend to unfold. A veteran with an established PTSD rating gets diagnosed with GERD, usually after going to primary care complaining of heartburn, chest discomfort, or chronic cough. They get put on a proton pump inhibitor. They file a secondary claim. The VA schedules a C&P exam.

The C&P examiner is rarely a GI specialist or a sleep medicine specialist or anything other than a general medical examiner. They review the file, do a short exam, and write an opinion. The opinion is often two or three sentences. It says something like "the veteran's GERD is less likely than not caused by his service-connected PTSD. GERD is commonly caused by dietary factors, obesity, and H. pylori infection, none of which are service-connected."

That gets the claim denied. The veteran appeals. Months or years later, the case lands at the BVA, where the judge looks at the same opinion and notices what's missing.

The pattern in successful appeals tends to involve the veteran obtaining a private medical opinion that does the work the C&P examiner didn't. Specifically, the private opinion identifies one or more of the three pathways, cites supporting research, and explains how the pathway applies to this particular veteran. When the Board sees that kind of opinion next to a bare-bones C&P denial, it often grants.

The Board has been pretty direct about what makes a medical opinion persuasive. From the PTSD analysis I did last year, the standard the Board applies is: "A medical opinion is most probative if it is factually accurate, fully articulated, and based on sound reasoning."

A C&P opinion that names diet or H. pylori as the cause without explaining why those factors are operative for this veteran, while the veteran is also on multiple medications that independently cause GERD, isn't "fully articulated" in the way the Board uses that phrase. It's a conclusion without a rationale.

What a Strong Nexus Letter Actually Looks Like

A strong nexus opinion in a GERD secondary to PTSD case tends to do five things. It names both theories under 38 CFR § 3.310, causation and aggravation. It identifies a specific pathway from PTSD to GERD. It cites the relevant medical literature, briefly, on chronic stress and gastric function or on the specific medications the veteran is taking. It applies that literature to the veteran's symptom history and medication list. And it anticipates and rebuts the common alternative explanations, particularly H. pylori and diet.

The cases that win tend to have nexus letters that read something like: "It is at least as likely as not that this veteran's GERD is proximately due to or aggravated by his service-connected PTSD. The medical literature establishes that chronic stress states characteristic of PTSD lead to gastric acid hypersecretion and lower esophageal sphincter dysfunction. The veteran's pharmacological treatment for PTSD includes sertraline and clonazepam, both of which are independently associated with reflux symptoms. H. pylori testing was negative on [date]. Considering symptom onset following PTSD diagnosis and the absence of significant pre-PTSD reflux history, the GERD is more likely than not secondary to the service-connected PTSD."

That's an opinion that does the work. It cites literature, applies it to the individual, and rebuts the alternatives. Compare it to a typical C&P denial: "It is less likely than not that the veteran's GERD is caused by his service-connected PTSD. GERD is commonly caused by dietary and lifestyle factors." The first opinion engages with the framework. The second names a conclusion and stops.

I don't know the exact grant rate at the Board for GERD-secondary-to-PTSD specifically. Across the broader GERD corpus of 2,248 cases, strong nexus opinions granted at 64.6 percent across 359 cases versus 10.9 percent for weak opinions across 238. The grant rate on strong nexus is lower for GERD than for some other conditions in this dataset, which is consistent with GERD claims facing more durable alternative-cause arguments (diet, H. pylori) than chains like sleep apnea or anxiety. Across the broader PTSD dataset, cases with strong nexus opinions granted at 93.7 percent versus 4.9 percent for weak. The directional pattern is the same: nexus quality is what carries the case.

Where the H. pylori and Diet Arguments Get Stuck

The H. pylori and dietary arguments are the most common reasons GERD secondary claims get denied at the RO. The C&P opinion names one of these alternative causes, the rater accepts it, and the claim dies.

The Board has approached these alternative explanations a few different ways. In cases where the medical record shows H. pylori testing was negative, or where the H. pylori was treated and the GERD persisted, the Board has been receptive to arguments that H. pylori isn't the operative cause. In cases involving dietary factors, the Board has sometimes accepted arguments that the dietary changes themselves are tied to PTSD, whether through medication-induced changes in appetite, stress eating, or comorbid conditions like depression that alter food choices.

The cases that get denied on these alternative explanations are usually the ones where the private opinion doesn't address them. If the nexus letter doesn't explain why H. pylori or diet isn't the operative cause for this veteran, the Board can default to the C&P examiner's framing. The opinions that win tend to anticipate the alternative explanations and rebut them head-on.

I'm not in a position to tell anyone what their nexus letter should say, that's not my role, but the pattern in winning cases is consistent. The opinions that work address the alternative-cause arguments directly. The ones that don't, often don't.

The Rating Math: 0, 10, 30, and 60 Under DC 7346

DC 7346 rating tiers

GERD is rated under 38 CFR § 4.114, Diagnostic Code 7346, which is the diagnostic code for hiatal hernia and is the code GERD is rated under by analogy. The rating structure is:

  • 0 percent, with symptoms that don't meet the criteria for a compensable rating
  • 10 percent, with two or more of the symptoms listed for the 30 percent rating, but of lesser severity
  • 30 percent, with persistently recurrent epigastric distress with dysphagia, pyrosis, and regurgitation, accompanied by substernal or arm or shoulder pain, productive of considerable impairment of health
  • 60 percent, with symptoms of pain, vomiting, material weight loss and hematemesis or melena with moderate anemia, or other symptom combinations productive of severe impairment of health

The 30 percent rating is the most common GERD rating for veterans whose reflux is symptomatic enough to require chronic PPI therapy and who have at least some functional impact from the symptoms. The 60 percent rating requires fairly severe findings, including the weight loss and anemia language, so it shows up less often in practice.

Combined rating math: 70% PTSD + 30% GERD

Now the combined rating math, because this is where the secondary claim becomes meaningful in dollars. PTSD ratings under 38 CFR § 4.130 typically sit at 30, 50, 70, or 100 percent. For a veteran already at 70 percent PTSD, adding a 30 percent GERD rating works out as follows on the VA combined ratings table. Take the larger rating first, 70 percent. The remaining capacity is 30 percent of the body. The 30 percent GERD takes 30 percent of that remaining 30 percent, which is 9 percent. 70 plus 9 is 79. The VA rounds to the nearest 10, so the combined rating goes to 80.

That's a 10-point bump from a single secondary claim, and it crosses the 80 percent threshold which has its own implications for ancillary benefits eligibility. The difference between 70 and 80 percent in 2026 rates, single veteran no dependents, is roughly $1,756 versus $2,044 per month. About $288 per month, $3,456 per year, tax-free. Over a decade, that's $34,560 from a single secondary granted.

For veterans already at 70 percent PTSD with chronic GERD requiring PPI therapy, this is one of the higher-yield secondary claims that doesn't require complex evidence development. The medical chain is well-documented. The pathways are defensible. The rating math is clean.

Why This Chain Works Particularly Well for Veterans on Chronic PTSD Medication

Of the three pathways, the medication pathway has the cleanest evidentiary trail. A veteran on chronic SSRI or benzodiazepine therapy has a documented prescription history. The prescribing information for those medications lists GI side effects. The medical literature is published and citable.

For veterans whose only PTSD treatment is talk therapy, the case rests on the chronic stress pathway and the autonomic pathway, both real but harder to document in any specific individual. For veterans on long-term psychiatric medication, the case is much more concrete. There's a prescribed drug, a documented side effect profile, and a temporal relationship between starting the medication and the onset or worsening of reflux.

The Board has been receptive to the medication pathway when it's laid out clearly. The challenge isn't medical plausibility. It's making sure the C&P examiner, or the private opinion, actually engages with the medication question rather than skipping past it to talk about diet.

Why This Matters Beyond the Individual Claim

The information asymmetry on this one runs deep. The medical literature backing GERD secondary to PTSD has been accumulating for decades. Gastroenterologists who work with psychiatric populations consider the link well-established. The pharmacology of SSRIs and benzodiazepines is on the prescribing information label.

And yet the typical pathway through the system is a C&P opinion that says "diet" or "H. pylori," a denial, a years-long appeal, and a private nexus letter eventually winning the case at the Board. Veterans who can afford private IMEs, or whose VSOs help them get one, navigate this without much trouble. Veterans who can't, eat the denial.

That's the gap I built Claim Raven to close. The medical pathways aren't a secret. The Board's evidentiary standard isn't a secret. The 38 CFR § 3.310 framework isn't a secret. The information just doesn't make it to the veteran sitting in primary care getting handed a PPI prescription and told to lose weight.

Bottom Line

GERD secondary to PTSD is one of the most medically defensible secondary claims in the VA system, backed by three documented pathways in the published research: chronic stress driving gastric acid changes, psychiatric medications producing direct GI side effects, and autonomic dysregulation affecting the lower esophageal sphincter. The 38 CFR § 3.310 framework, combined with Allen v. Brown's recognition of aggravation theory, gives veterans two independent legal theories to win on. The cases that fail typically fail on weak nexus opinions, particularly C&P opinions that name diet or H. pylori as alternative causes without addressing the veteran's medication history or the stress pathway. The cases that succeed at the Board tend to have private opinions that identify a specific pathway, cite supporting literature, and rebut the alternative-cause arguments. With GERD rating at 30 percent under DC 7346, the secondary grant moves a veteran at 70 percent PTSD to a combined 80 percent rating, which matters both in monthly compensation and in qualifying thresholds for ancillary benefits.

Methodology and Limitations

  • Data source: Claim Raven's broader analysis of 1,640 BVA decisions involving PTSD claims, with the GERD secondary subset drawn from that pool. Medical literature references drawn from published research on chronic stress and gastric function, SSRI and benzodiazepine pharmacology, and autonomic dysfunction in PTSD populations (Mysliwiec and others on somatic symptoms in veterans).
  • Sample size: 2,248 GERD cases at the BVA level (825 granted, 841 denied, 582 remanded). The GERD-secondary-to-PTSD subset isn't separately tabulated in the current aggregates. The broader PTSD pool is 1,640 cases. * Classification approach: Cases were categorized by whether the secondary GERD claim was granted, denied, or remanded, and by the nature of the medical evidence in the record, including C&P opinion only, private IME, or both.
  • Limitations:
  • These are cases that made it to the BVA. They don't represent all GERD secondary claims. Cases granted at the RO level, or denied without appeal, aren't in this dataset.
  • The medical pathway classifications are based on what the Board cited in its decision. Cases where the Board didn't elaborate on the mechanism may have involved any of the three pathways, or others.
  • H. pylori status is a complicating variable. Cases where the veteran tested positive for H. pylori at some point may still have GERD that's primarily medication-driven or stress-driven, but the data can't always disentangle these factors at the individual case level.
  • The rating math example uses 70 percent PTSD plus 30 percent GERD. Different starting PTSD ratings or different GERD ratings produce different combined outcomes.
  • Medical literature citations in this post are general references to research areas, not specific studies. Individual studies vary in methodology and sample.
  • The Board's standard for what counts as a "strong" versus "weak" nexus opinion is somewhat subjective and depends on the language used in individual decisions.

Disclaimer

I'm not accredited by VA, not a lawyer, not a VSO. This is data analysis, not claim advice. These are patterns from cases that made it to the BVA, they don't predict individual outcomes. If you need help with your claim, work with an accredited representative.

Where to go next

-Landon Founder, Claim Raven | U.S. Army Veteran