What Is a Presumptive Condition for Gulf War Veterans?
A presumptive condition means the VA assumes the condition is service-connected if certain criteria are met, without the veteran having to prove a direct in-service cause. For Gulf War veterans, IBS falls under undiagnosed gastrointestinal disorders associated with service in the Southwest Asia theater during the Gulf War (1990–1991).
Key facts:
- Presumptive IBS is listed under 38 CFR § 3.317 (chronic undiagnosed illnesses).
- Veterans must have served in the Gulf War theater and developed gastrointestinal symptoms either during or after service.
The presumption helps overcome the common VA hurdle of establishing a direct service link.

Step 1: Understanding the Evidence the VA Needs
Even presumptive conditions require documentation to support your claim. The VA evaluates both service records and medical evidence to confirm eligibility. Key components include:
Medical Diagnosis
- A formal IBS diagnosis from a qualified provider (gastroenterologist, primary care physician, or VA clinician).
- Documentation should specify symptoms, duration, and impact on daily functioning.
Symptom History
- Records of chronic diarrhea, constipation, abdominal pain, or bloating.
- Evidence that symptoms persisted for at least six months or more.
- Detailed symptom logs or diaries help illustrate severity and frequency.

Service Records
- Deployment or duty assignments in Southwest Asia during the Gulf War.
- In-service reports of gastrointestinal complaints, even if undiagnosed at the time.
Step 2: Leveraging Medical Experts
While presumptive service connection simplifies the process, medical expert input is often the difference between approval and denial.
Nexus Letters
A nexus letter explains medically how your IBS relates to Gulf War service, even if your condition appeared post-deployment. Experts at Attain Med Group provide nexus letters that:
- Review service records, treatment history, and private records.
- Address VA requirements using the “at least as likely as not” standard.
- Highlight aggravating factors, secondary conditions, and symptom progression.
Specialist Evaluations
Gastroenterologists and other specialists can document:
- Objective findings (e.g., colonoscopy results, lab work).
- Symptom severity and functional limitations.
- Response to treatments or medications.
Example: A veteran treated for chronic diarrhea and abdominal pain post-deployment can have a gastroenterologist confirm IBS as consistent with Gulf War-related undiagnosed GI disorders.

Step 3: Secondary Service Connections
IBS often develops alongside or as a result of other service-connected conditions. For Gulf War veterans, secondary conditions may include:
- PTSD-related gastrointestinal disturbances
- Anxiety or depression affecting bowel function
- Medications prescribed for chronic pain impacting digestive health
A secondary connection medical opinion can significantly increase the likelihood of VA approval, particularly when linking IBS to an already service-connected condition.
Step 4: Collecting Comprehensive Evidence
Recommended Documentation
- VA medical records showing gastrointestinal complaints.
- Private medical records, including specialist notes and lab results.
- Symptom logs tracking episodes of diarrhea, constipation, or abdominal pain.
- Hospital or urgent care visit summaries for GI issues.
- Lay statements from family or coworkers describing the impact of IBS on daily life.
Tip: Consistent, longitudinal evidence demonstrating chronicity and severity strengthens claims, even under presumptive conditions.
Step 5: Filing the Claim
- Submit VA Form 21-526EZ for new claims or VA Form 20-0995 for supplemental claims.
- Attach all medical records, nexus letters, and symptom documentation.
- Highlight evidence supporting presumptive service connection.
- Keep copies of every submission for your records.

Why Working with Attain Med Group Makes a Difference
At Attain Med Group, we specialize in veteran-centered medical documentation that bridges gaps in evidence. Our team helps you:
- Obtain expert nexus letters linking IBS to Gulf War service.
- Compile and review all relevant VA and private medical records.
- Ensure claims meet VA standards for presumptive conditions.
- Navigate secondary connections and symptom documentation.
Veteran-owned, veteran-focused: We understand the challenges you face and provide evidence-based support to maximize your benefits.
Take Action: Strengthen Your IBS VA Claim Today
If you are a Gulf War veteran with IBS symptoms, now is the time to secure the benefits you deserve. Contact Attain Med Group to:
- Schedule a review of your medical and service records
- Obtain a professional nexus letter
- Ensure your claim meets VA standards for presumptive service connection
Don’t let missing or incomplete documentation hold your claim back. Let our expert team guide you through every step to approval.