
Secondary Conditions
Conditions caused or aggravated by your service-connected disabilities — the most underutilized strategy in VA claims
What Is Secondary Service Connection?
Under 38 CFR §3.310, a disability that is caused by or aggravated by an already service-connected condition is itself service-connected. This is called secondary service connection, and it is one of the most powerful — and most underutilized — tools in the VA disability system.
The VA will not tell you which secondary conditions you should claim. That is your responsibility — or your representative's. Most veterans have at least one secondary condition they have never filed for, and many have three or more. Each one adds to your combined rating and your monthly compensation.
There are two types of secondary connection: causation (the service-connected condition directly caused the new condition) and aggravation (the service-connected condition made a pre-existing condition worse beyond its natural progression). Both are compensable.
Common Secondary Condition Chains
PTSD →
Diabetes Type 2 (Agent Orange) →
Knee / Back Injury →
TBI →
Chronic Pain (any) →
The Bilateral Factor — §4.26 Bonus for Paired Extremities
When service-connected conditions affect paired extremities (both knees, both shoulders, one arm and one leg), the combined value of those bilateral disabilities gets a 10% bonus under 38 CFR §4.26.
Example: A veteran with a service-connected right knee rated at 20% develops left knee arthritis from compensatory gait changes. The left knee is claimed as secondary at 10%. With the bilateral factor: the bilateral value of 28% receives a 10% bonus (2.8 percentage points added), increasing the effective bilateral contribution to approximately 31%. This pushes the veteran closer to the next rounding threshold in the combined ratings formula.
Secondary conditions frequently create bilateral pairs that the veteran has never claimed. We identify these pairs specifically.
The Evidence Standard for Secondary Claims
Related Services
A worsening primary condition often spawns new secondary conditions — claim both simultaneously
Agent Orange presumptive conditions like diabetes can unlock entire secondary chains
See how each secondary condition adds to your total — and where the bilateral factor kicks in
Every secondary claim needs a nexus opinion — we prescribe exactly what it must say
The Advocate's Take
Secondary conditions are where the most money is left on the table. A veteran with PTSD who never claimed sleep apnea, depression, or erectile dysfunction as secondary conditions could be missing 50-100 additional combined rating points. The VA is not going to tell you to file these — they are not required to.
We review every file for secondary condition opportunities, identify the chains, and build the nexus evidence to support each one. If your body is broken because of what the military did to you, every condition that flows from that original injury should be compensated. And if those secondary conditions create bilateral pairs, the §4.26 bilateral factor gives you an additional bonus most veterans never knew existed.
Frequently Asked Questions
What is the difference between direct secondary and aggravation?
How many secondary conditions can I claim?
What evidence do I need for a secondary condition?
Can a condition be secondary to a 0% rated condition?
What is the bilateral factor and how does it help secondary claims?
Can PTSD cause secondary physical conditions?
How do secondary conditions affect my combined rating?
Secondary Conditions Map — See the Chains
One service-connected condition can spawn multiple secondary claims. This interactive map shows the most common chains for PTSD, diabetes, and musculoskeletal conditions.
One Condition Can Unlock Many
A service-connected condition that CAUSES or AGGRAVATES another earns its own rating. Most veterans leave these on the table.
Examples only — secondary connection always requires a medical nexus. Not a diagnosis.
Real Veterans. Real Claims. Real Outcomes.
Every case on this desk belongs to someone who served. These are the veterans this practice represents — across every era, branch, and condition.
Veteran Representation
Veteran Representation
Veteran RepresentationKnow What the C&P Exam Should Look Like
The VA produced this explainer of the claim exam.
Your VA Claim Exam: What to Expect
Tips to Prepare for Your VA Claim Exam
Three Ways to Put an Accredited Agent on Secondary Conditions
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