Veterans with PTSD file for GERD more often than almost any other secondary condition, and for good reason. The gut-brain connection is one of the most studied pathways in psychosomatic medicine, and the evidence supporting PTSD as a cause of acid reflux is strong enough that VA raters and C&P examiners encounter this claim routinely.
PTSD keeps the nervous system in a chronic state of threat response. That sustained activation has real, measurable effects on every organ system, including the gastrointestinal tract.
The vagus nerve governs much of the digestive process. In PTSD, the autonomic nervous system tilts heavily toward sympathetic (fight-or-flight) dominance. Sympathetic activation slows gastric motility, impairs lower esophageal sphincter (LES) tone, and increases acid secretion. The result is a gut that empties slowly, a sphincter that closes incompletely, and more acid than it needs.
Chronic stress elevates cortisol. Sustained cortisol exposure affects the gut lining, alters pain thresholds in the esophagus, and increases what gastroenterologists call visceral hypersensitivity. That means PTSD patients often feel reflux symptoms more intensely even at lower acid volumes. Published research in peer-reviewed gastroenterology literature has consistently documented elevated rates of GERD and functional GI disorders in individuals with PTSD and trauma histories, supporting the gut-brain axis as a well-recognized physiological mechanism rather than a speculative theory.
PTSD disrupts sleep architecture. Nighttime reflux is significantly worse in people with poor sleep, because lying down and reduced swallowing frequency during sleep allow acid to pool in the esophagus longer. If your PTSD is causing insomnia or hyperarousal at night, your reflux may be worsening through this separate mechanism.
Under 38 CFR 3.310, a condition is secondary service-connected when it is caused by or aggravated by a service-connected disability. You don't need to prove PTSD is the only cause of your GERD. You need to show it is at least as likely as not a contributing cause or that it worsens GERD you already had.
This is a meaningful distinction. Veterans who had mild reflux before service may still prevail if their PTSD has aggravated that pre-existing condition beyond its natural progression.
A generic letter that says "PTSD can cause GERD" will not win your claim. VA requires a nexus letter that:
A physician who has not reviewed your records cannot write a credible opinion. The C&P examiner will note that gap immediately.
VA raters often deny GERD-secondary-to-PTSD claims on two grounds:
"GERD is a common condition unrelated to PTSD." This is countered by noting that the veteran's GERD onset or significant worsening coincides with PTSD diagnosis and treatment, not with dietary changes or aging alone.
"No nexus established." This usually means the nexus letter was either too general or the C&P examiner provided a negative opinion. A well-documented independent medical opinion from a physician who reviewed the full record is the most effective counter.
Many veterans with PTSD take medications that independently cause or worsen GERD. SSRIs, SNRIs, and some atypical antipsychotics relax the lower esophageal sphincter or delay gastric emptying. If you're treating PTSD with these medications, you may have an independent secondary claim under a medication-nexus theory as well.
For more on that angle, see GERD secondary to medications for service-connected conditions.
Your claim is stronger when it includes:
See also how to document GERD symptoms for a VA claim for practical steps on building the evidence file.
If you're pursuing a GERD secondary to PTSD claim, the quality of your nexus letter is the single biggest factor in the outcome. Flat Rate Nexus provides physician-signed independent medical opinions reviewed by a board-certified physician with experience in VA secondary claims. Free educational tools, including a nexus letter grader and C&P exam prep resource, are available at flatratenexus.com.
Thinking about your own claim? Every nexus letter we write goes through a full physician record review, cites peer-reviewed research, and is built around the actual evidence in your case.
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