Get Veterans Service-Connected Disability for an Aggravated Pre-Existing Condition

Veterans who became disabled due to an injury or illness caused by their military service ("service-connected") can get compensation from the Department of Veterans Affairs (VA). But you can’t get VA disability for a pre-existing condition unless your medical condition was aggravated (made worse) by your military service.

Proving your aggravated pre-existing condition is both disabling and service-connected can be more difficult than proving that your military duty caused a new service-connected injury, but as long as it’s tied to your time in the military, it’s not impossible. Before you apply for VA disability compensation, it’s helpful to learn how the agency evaluates claims for aggravated service-connection and what evidence you’ll need for a successful claim.

Can I Get VA Disability for a Pre-Existing Condition?

The VA generally won’t pay disability compensation for any medical condition that isn’t service-connected. But if you have a pre-existing condition that was exacerbated by your military service, the aggravation of your preservice disability can be considered service-related.

There are two steps to qualifying for service-connected disability compensation based on "aggravation of a preservice disability." To get your claim approved, you’ll need to prove both that you had a pre-existing condition when you enlisted and that the condition was made worse by your time in service.

How Does the VA Define Aggravation?

The VA defines aggravation as the worsening of a veteran’s nonservice-related condition. The VA will consider an aggravation service-related when you’ve experienced “an increase in disability during such service.” Under this definition, for the aggravation of your pre-existing condition to be considered service-connected, it must qualify as either one of the following:

• an in-service aggravation, meaning a pre-existing injury or illness that was made worse by your time in the military, or
• a post-service aggravation, which is a nonservice-related injury or illness that was made worse by a service-connected disability.

As an example, let’s say your right knee was injured in a car accident when you were a child. When you joined the military, it was still a little stiff, but it didn’t prevent you from walking or climbing. Your military entrance exam indicates your right knee had a flexion of only 125 degrees (normal is 135). After military service, you had severe pain and deterioration of your right knee joint and eventually had knee replacement surgery.

If your job in the military required you to bend and stoop a lot, carry heavy items, and climb ladders frequently, your service could very well have caused the condition of your right knee to deteriorate (in-service aggravation). Because it’s documented as a pre-existing condition, you’d only need to show that your service caused it to get worse. You wouldn’t have to point to a specific event as the aggravating factor.

Or, say your left knee was damaged while on active duty, and you’re already getting a disability rating of 30% for that injury. Because of the left knee injury, you begin to favor your right side, which over time causes your right knee to get worse as well. In order to get additional disability compensation for your right knee, you’ll need to show that the service-connected disability in your left knee aggravated the pre-existing condition of your right knee.

How Do I Prove a Pre-Existing Condition?

The easiest way to prove you had a pre-existing condition is to show that the military noted this condition when you first went into service. The records from your entrance medical exam might include this information, but that’s not the only way to show you had a preservice medical condition.

Your Military Entrance Exam Mentions Your Preservice Condition

If your entrance medical exam mentions the existence of your pre-existing condition, this will prove to the VA that you did indeed have the medical condition before you went into the service. If you have records showing that your disability worsened while you were on active duty, the VA will generally presume service caused you to get worse.

Your Military Entrance Exam Doesn’t Mention Your Preservice Condition

If your entrance exam doesn't mention your preservice condition, the VA will assume that you were in sound physical and mental health when you entered military service. You can’t get disability for aggravation of a pre-existing condition until you can prove that you had the problem before your military service. That’s where your doctor can help.

Ask your doctor to write a letter to the VA and attach medical records showing that you had the impairment before you entered service, and gather medical records that establish treatment or a diagnosis for the condition before your military service began. Your doctor’s letter won’t carry much weight if no medical records are provided, but what the doctor says in the letter is also important. It’s best if your doctor can say that you definitely had the condition before being in the service. A doctor’s statement that says you probably had the disability might not satisfy the VA.

How Do I Prove My Condition Worsened Due to Active Duty Service?

If you were able to prove that you were disabled prior to service, the next step is to show that your condition increased in severity while you were on active duty. But you don’t necessarily need to prove that any particular incident occurred to cause the aggravation. You need only prove that your disability got worse because of your military service.

Proving the Aggravation Is Service-Connected

The VA won’t award you benefits simply because your pre-existing disability got worse. You’ll have to show that the worsening of your impairment wasn’t just the natural progression of your pre-service condition. If the VA can prove that your disability would’ve worsened even if you weren’t in service, the agency can deny your claim for benefits. But the VA must have clear and unmistakable evidence to prove your military service didn't cause your condition to get worse, which is a high legal standard to meet.

Temporary Symptoms Aren’t Enough Proof of Aggravation

If you merely had a flare-up of your disability or had only a temporary worsening of your symptoms, this won’t be enough to prove that your disability worsened while you were in the service. Temporary symptoms aren’t considered adequate legal proof. You can get help from your doctor to prove that your underlying disability (and not just your symptoms) got permanently worse.

Special Rule for Combat Veterans or Former POWs

It’s easier to qualify for aggravated service-connected disability benefits if you served in combat or were a prisoner of war. In this case, you can use lay evidence to show that your condition got worse during service. (38 U.S.C. § 1154(b) (2026).) The VA has this special rule to compensate for the difficulty of maintaining medical records in combat situations. But you’ll still have to show that your condition was aggravated beyond its natural progression.

Examples of Common Conditions That Military Service Can Aggravate

When military service aggravates a pre-existing medical condition, everyday activities like working and caring for your family become more difficult. Musculoskeletal conditions, like the aggravated knee injury used as an example above, aren’t the only medical impairments that can be aggravated by military service. Some common conditions include the following:

• Hearing loss. Mild hearing loss might not hinder your ability to function day-to-day, but more severe hearing loss could significantly affect your ability to communicate. If you were exposed to loud noises in the military and your hearing loss worsened, the aggravated condition would be a service-connected disability.
• Depression. If you were treated for mild depression before joining the service and suffered trauma while on active duty resulting in PTSD, it’s likely your depression symptoms could also worsen. If you developed major depression due to your time in the military, that would count as an aggravated service-connected disability.
• Asthma. If you entered military service with mild asthma, exposure to environmental triggers like pollution, dust, and smoke while on active duty could have aggravated your condition. If it did, you’d likely qualify for VA disability benefits.

Applying for VA Disability for a Prior Injury

There are a couple of ways you can apply for VA disability benefits for an aggravated pre-existing condition. You'll need to complete Form 21-526EZ, Application for Disability Compensation and Related Compensation Benefits, which you can do in a few ways:

• Apply online using the electronic version of Form 21-526.
• Fax Form 21-526EZ to 844-531-7818 (from inside the United States) or 248-524-4260 (from outside the U.S.).
• Bring your application to your local VA office.
• Mail the form to the Department of Veterans Affairs, Claims Intake Center, PO Box 4444, Janesville, WI 53547-4444.

Learn more about how to file for disability benefits from the VA.

How Much Can I Get in VA Disability Compensation for an Aggravated Disability?

The amount of disability compensation you’ll receive if you’re awarded benefits doesn’t depend on the type of service connection you’ve established. Instead, your monthly benefit is calculated using a combination of your disability percentage rating and your living situation. For example, in 2026, an individual veteran with a 30% rating can receive $552.47 every month while an individual veteran with a 60% rating can receive $1,435.02. Veterans with the same disability rating (30% and 60%) but who are married with one dependent child will receive higher payments, at $666.47and $1,663.02 respectively. You can estimate your benefits by reviewing the current VA disability compensation tables.

What If I'm Denied VA Benefits for a Pre-Existing Condition?

If your pre-existing condition wasn't mentioned on your military entrance exam, and your doctor couldn’t satisfy the VA that you had the condition prior to service, you’ll face a difficult hurdle. You have to show by the legal standard of clear and unmistakable evidence that the injury or illness predated your service.

This is a difficult legal standard to meet without verification from your military entrance exam or your doctor. To prove your disability is service-connected in such a case, you might need a disability attorney to help you. If the VA denied your benefits for a pre-existing condition aggravated by your military service, you have the right to appeal. (Learn more in our article about appealing a VA denial of benefits.)