Having PTSD and another diagnosed condition does not, by itself, establish that one caused the other. For a secondary VA claim, the useful question is whether the evidence connects the additional disability to a service-connected condition or its treatment.
That connection can involve causation or aggravation. They are different questions, and a medical opinion may need to address both.
I approach lists of “PTSD secondary conditions” cautiously. A list can help you recognize a question worth discussing with a clinician. It cannot diagnose you, establish a nexus or tell you which disabilities to claim.
Two possible connections need different explanations
38 C.F.R. § 3.310 addresses disabilities caused by, or aggravated by, service-connected disease or injury.
Causation asks whether the service-connected condition caused the additional disability. Aggravation asks whether it increased the severity of another condition beyond that condition's natural progress.
For aggravation, the regulation addresses medical evidence of the baseline level of severity and how the additional impairment is determined. The relevant baseline is tied to the onset of aggravation, not automatically the date VA first granted service connection for PTSD.
A conclusion that PTSD did not cause a condition does not necessarily answer whether it aggravated that condition. The opinion should explain the question it actually evaluated.
Conditions that may warrant a medical conversation
VA's National Center for PTSD discusses relationships between PTSD and physical health. Research has found associations across several health problems. Those associations differ in strength, and people can have multiple overlapping risk factors.
| Health issue | A useful question for the clinical record |
|---|---|
| Obstructive sleep apnea | What establishes the diagnosis, and what evidence supports the proposed relationship to PTSD or treatment in this person? |
| Headaches or migraines | What is the headache diagnosis, when did it begin, and how do symptoms, triggers and treatment relate to the psychiatric history? |
| Gastrointestinal symptoms | Is there a diagnosed digestive condition, and what supports a causal or aggravating relationship rather than symptoms merely occurring at the same time? |
| Sexual-function symptoms | Could the symptoms relate to a diagnosed condition, a treatment effect or another cause that needs evaluation? |
| Cardiovascular or metabolic disease | How do the veteran's complete medical history and other risk factors affect the proposed connection? |
This is a set of questions, not a complete list of compensable conditions. Do not assume every item applies to someone with PTSD.
Sleep problems require a specific diagnosis
Insomnia and nightmares can be part of PTSD. Obstructive sleep apnea involves disrupted breathing during sleep and requires its own clinical evaluation. They should not be treated as interchangeable labels for feeling tired.
VA's sleep guidance describes sleep apnea as common among people with PTSD, especially veterans, and explains the role of a sleep study. That supports evaluating a health concern. It does not establish that PTSD caused every case of sleep apnea.
A bed partner may be able to describe snoring or observed breathing interruptions. Those observations can help establish history, while the diagnosis and the medical relationship require the appropriate clinical assessment.
Medication history can matter without proving the claim
If the proposed connection involves treatment for PTSD, preserve a dated medication history, dose changes, reported symptoms and the clinician's assessment of possible effects. A known possible side effect does not prove that it caused a particular veteran's disability.
A useful opinion addresses the actual timeline and other plausible explanations. It should make clear whether it is discussing the diagnosis, the cause, worsening of an existing condition or all three.
Do not stop or change prescribed treatment to build a claim. Raise concerns with the treating clinician and keep the benefits question separate from decisions about care.
A record map is more useful than a generic letter
Before requesting another medical opinion, organize what you already have:
- The decision establishing the relevant service-connected condition.
- Records establishing the additional diagnosis and its course over time.
- The history of symptoms, treatment and relevant medication changes.
- Any prior opinion explaining or disputing the proposed connection.
- The specific gap identified in a denial, if VA has already decided the issue.
For example, “my headaches became more frequent after this documented change, and these are the dated treatment notes” gives a clinician a history to evaluate. It still leaves the clinician responsible for deciding whether the proposed connection is supported.
A nexus letter is one way to document a medical opinion. Purchasing one is not a requirement for every claim, and the provider's conclusion does not bind VA.
Service connection and the rating are separate decisions
If a secondary condition is service connected, VA evaluates it under the applicable rating criteria. Those criteria can change. For digestive conditions, relying on a pre-2024 GERD or IBS table can produce an inaccurate explanation of a newer rating decision.
Do not add percentages arithmetically. Under VA's combined-ratings method, 70% and 50% combine to 85%, which rounds to 90%, assuming no other ratings or applicable adjustments. They do not combine to 120% or 91%. VA explains the combined-ratings process here.
The purpose of documenting a secondary condition is an accurate record of the disability and its relationship to service. A desired combined percentage should not determine the diagnosis or what someone reports to an examiner.
Sources and scope
The legal framework is section 3.310; the medical context comes from the National Center for PTSD pages linked above. This article does not claim that a population-level association proves an individual nexus, and it offers no success-rate estimate. Sources reviewed September 16, 2026. For a disputed claim or a complex aggravation question, an accredited representative can help identify the evidence and review route that fit the decision.
GERD Secondary to PTSD: VA Rating, Nexus Letter and Evidence
Sleep Apnea Secondary to Tinnitus: What VA and the Board Need
Migraines Secondary to PTSD: VA Claim Evidence and Ratings