VA Secondary Conditions: How to Claim Them

What are secondary conditions?

Secondary conditions are disabilities that are caused by or aggravated by a condition you’re already service-connected for. Under 38 CFR § 3.310, a disability proximately due to a service-connected condition is itself service connected, and is considered part of the original condition.

Some veterans have service-connected conditions causing additional health problems they haven’t claimed.

Here’s how it works: You’re service-connected for a back injury. That back injury causes chronic pain, which disrupts your sleep and leads to depression. The depression is secondary to your service-connected back injury. If approved, the VA rates and compensates the depression as a service-connected condition.

Two types of secondary service connection

1. Causation (proximate cause)

Your service-connected condition directly caused a new condition. The new condition would not exist without the primary condition.

Examples:

• Service-connected PTSD causes sleep disturbance, leading to sleep apnea
• Service-connected back injury causes altered gait, leading to hip pain or knee problems
• Medications for a service-connected condition cause GERD, erectile dysfunction, or weight gain

2. Aggravation

Your service-connected condition worsened a non-service-connected condition beyond its natural progress.

Examples:

• Service-connected chronic pain aggravates a non-service-connected anxiety disorder
• A service-connected knee condition aggravates a non-service-connected back condition through altered gait

Important: For aggravation claims, VA only compensates the degree of worsening caused by the service-connected condition, not the full severity. Under 38 CFR § 3.310(b), VA needs medical evidence establishing the baseline severity — created before the aggravation began, or the earliest medical evidence after it — and it deducts both the baseline and any natural progression.

Common secondary condition pairs

These are commonly claimed secondary relationships. Whether one applies to you depends on the medical evidence in your case:

Mental health secondaries

Musculoskeletal secondaries

Medication-related secondaries

Systemic secondaries

How to file a secondary condition claim

Step 1: Identify potential secondary conditions

Review your existing service-connected conditions and think about what other health problems they cause or worsen. Ask yourself:

• Has my service-connected condition caused new health problems?
• Do I take medications that cause side effects?
• Has my condition changed how I walk, move, or sleep?
• Has chronic pain affected my mental health?
• Has a mental health condition affected my physical health?

Look at the common pairs listed above. Talk to your doctor about potential connections.

Step 2: Get a medical diagnosis

You need a current diagnosis for the secondary condition from a qualified medical provider. Without a diagnosis, there’s nothing to rate.

Step 3: Obtain a nexus letter

A nexus letter is a medical opinion from a qualified provider about whether your secondary condition is connected to your primary service-connected condition. It isn’t always required — VA may get its own opinion from a C&P examiner — but in a secondary claim the medical link is usually the central question.

What a strong nexus letter includes:

1. Provider’s qualifications — Their medical credentials and relevant expertise
2. Review of records — Statement that they reviewed your medical history, service records, and VA records
3. Current diagnosis — Confirmation of the secondary condition
4. Medical opinion — Using the standard: “It is at least as likely as not (50% or greater probability) that [secondary condition] was caused by / is aggravated by [primary service-connected condition]”
5. Medical rationale — The scientific or clinical reasoning explaining how the primary condition leads to the secondary condition
6. Citation of medical literature — References to studies or medical texts supporting the connection

Example nexus statement:

“It is my professional medical opinion that it is at least as likely as not that this veteran’s diagnosed obstructive sleep apnea is caused by his service-connected PTSD. Medical literature supports that PTSD disrupts normal sleep architecture and contributes to weight gain through medication side effects and reduced physical activity, both of which are established risk factors for obstructive sleep apnea.”

Step 4: File your claim

File using VA Form 21-526EZ — the same form used for all disability claims. When filing:

1. Select “new” claim for the secondary condition
2. Clearly identify the condition as secondary to your existing service-connected disability
3. Specify which primary condition the secondary condition is connected to
4. Upload your nexus letter and supporting medical records

You can file online at VA.gov or with help from a VSO. For a detailed walkthrough, see our how to file guide.

Step 5: Attend your C&P exam

VA may schedule a C&P exam for the secondary condition. During the exam:

• Clearly explain the connection between your primary condition and the secondary condition
• Describe how the primary condition caused or worsened the secondary condition
• Provide a timeline — when did the secondary condition start relative to the primary?
• Mention if you have a nexus letter on file

How secondary conditions affect your combined rating

Each approved secondary condition is combined with your other ratings using VA math. Even a 10% secondary condition can sometimes push your combined rating to a new tier.

Example: A veteran with PTSD at 50% and back pain at 20% has a combined rating of 60%. Filing for radiculopathy (secondary to back pain) at 20% and sleep apnea (secondary to PTSD) at 50% changes the calculation significantly:

• PTSD 50% + sleep apnea 50% + back pain 20% + radiculopathy 20% = 84% → rounds to 80%

For a veteran with no dependents at 2026 rates, that’s a jump from $1,435.02/month to $2,102.15/month — an additional $667.13 per month tax-free.

Use our VA disability calculator to see exactly how adding secondary conditions would change your combined rating and payment.

Tips for success

1. Claim each connection the evidence supports

If your service-connected condition causes or worsens other diagnosed conditions, you can claim them. Each granted condition is factored into your combined rating.

2. Consider getting a medical opinion before filing

A nexus letter from your treating physician or a qualified specialist gives VA a medical opinion to weigh alongside any C&P exam opinion. VA considers all the evidence; a well-reasoned opinion is more useful than a conclusion without an explanation.

3. Be specific about the connection

Vague claims give VA less to work with. Rather than just claiming “depression secondary to back pain,” explain: “My chronic lower back pain rated at 40% prevents me from activities I enjoyed, disrupts my sleep nightly, and causes constant frustration and hopelessness, leading to my diagnosed major depressive disorder.”

4. Document the timeline

Show when the secondary condition developed relative to the primary condition. Medical records showing the secondary condition appeared after the primary condition was diagnosed can help show the sequence of events.

5. Claim medication side effects

Many veterans don’t realize that side effects from medications prescribed for service-connected conditions can be claimed as secondary conditions. If medical evidence shows your PTSD medication caused erectile dysfunction or your pain medication caused stomach problems, those can be claimed.

6. Don’t forget 0%-rated conditions

A 0% service-connected rating still allows you to claim secondary conditions. If you have a condition rated at 0%, it can still cause other health problems that deserve compensation.

7. Work with a VSO

Secondary condition claims can be complex, especially when establishing the medical connection. A VSO representative can review your conditions, identify potential secondaries you haven’t considered, and help you put together a complete claim. Find an accredited representative at VA.gov.

What if your secondary claim is denied?

If denied, review your decision letter to understand the specific reason:

• “No nexus” — The VA didn’t find sufficient evidence connecting the conditions. Obtain a stronger nexus letter and file a Supplemental Claim.
• “No current diagnosis” — If you now have a diagnosis, file a Supplemental Claim with that new evidence.
• “Not caused by or aggravated by” — The C&P examiner provided a negative opinion. Get an independent medical evaluation with a detailed nexus letter addressing the examiner’s reasoning and file a Supplemental Claim.

You can also request a Higher-Level Review or Board Appeal within one year if you believe VA made an error on the existing record.

Disclaimer: This content is for informational purposes only and does not constitute legal or medical advice. For personalized guidance on your VA disability claim, consult a VA-accredited Veterans Service Organization (VSO), attorney, or claims agent. You can find accredited representatives at VA.gov.