Insider strategy
The secondary conditions veterans forget to claim
A secondary condition is one your service-connected condition caused or made worse. It is the most overlooked way to raise a rating, and most veterans never file for the ones they already have.
Most veterans file for the injury they can point to. The bad knee. The ringing ears. The back that seized up on a deployment. What they leave on the table is everything that injury went on to cause: the second, third, and fourth conditions that grew out of the first one over the years.
The VA has a name for those. They are called secondary conditions, and they are the single most overlooked way to raise a rating. You already have the symptoms. You just never connected them to a claim.
The short version
A secondary condition is a disability that is caused or made worse by a condition the VA already service-connected. The rule is 38 CFR §3.310. Two things have to be true: the first condition must already be service-connected, and a medical opinion (a nexus) must link the second one to it. Get both, and the second condition rates on its own.
What "secondary" actually means
Service connection usually means an injury or illness that started in service. A secondary claim is different. The condition did not have to start in service at all. It only has to flow from something that did.
The regulation, 38 CFR §3.310, covers disability that is proximately due to or the result of a service-connected condition. It also covers a condition that existed on its own but was aggravated, meaning made permanently worse, by a service-connected one. Both count. Both rate.
That is the leverage. Your service-connected condition becomes an anchor, and anything it can be shown to have caused or worsened can hang off of it, even decades later.
The one rule that never bends
A secondary claim needs a primary that is already service-connected. If the anchor condition was denied or you never claimed it, there is nothing to attach to. Establish the primary first, then build the secondary onto it.
The connections veterans miss most
None of these are automatic. Every one is a link the VA recognizes when the medicine supports it, and every one still needs a doctor to write the opinion. Here is the practical map.
Sleep apnea, secondary to PTSD or to weight gain
This is the most common secondary of all. Research links post-traumatic stress disorder to a higher rate of sleep apnea, and there is a second path most veterans overlook: a service-connected condition that limits your activity or requires medication can drive weight gain, and weight gain drives apnea. Either route can support a claim. Neither is guaranteed, and both live or die on the sleep study and the nexus opinion.
Hypertension, secondary to sleep apnea or PTSD
High blood pressure rarely gets claimed on its own because it feels like a normal middle-age problem. But untreated sleep apnea strains the cardiovascular system, and chronic stress from PTSD does too. When a doctor ties your hypertension to one of those service-connected conditions, it can become its own rated disability.
GERD and acid reflux, secondary to your medications
Here is one almost nobody files. If you take anti-inflammatories or other daily medication for a service-connected condition, and those medications gave you chronic acid reflux, the reflux can be secondary to the treatment. The chain is condition to medication to stomach. A doctor has to state it plainly, but the logic is one the VA accepts.
Depression or anxiety, secondary to chronic pain
Living with a painful service-connected condition for years takes a mental toll. The VA recognizes that a chronic physical disability can cause or worsen depression and anxiety. Mental-health conditions carry meaningful ratings, and this is one of the most under-claimed secondaries because veterans think of the pain and the mood as two separate lives. They are not.
Radiculopathy, secondary to a service-connected back or neck
Radiculopathy is nerve pain that shoots down a limb, the sciatica-style pain into a leg or the tingling and weakness down an arm. It comes from a spine condition pressing on a nerve. If your back or neck is already service-connected, the nerve pain running down from it is often a separate ratable disability, one leg or arm at a time. Many veterans have the symptom and never realized it rates on its own.
Erectile dysfunction, secondary to PTSD, diabetes, or medications
Erectile dysfunction is frequently tied to PTSD, to diabetes, or to the medications used for either. It is compensated differently from most conditions: instead of a percentage rating, the VA pays it through Special Monthly Compensation at the K rate, or SMC-K, as loss of use of a reproductive organ. SMC-K is a fixed dollar amount the VA adds on top of your basic compensation, at any rating from 0 to 100 percent. You can read how SMC rates work on VA.gov. It is easy to raise with your provider and easy to forget to claim.
Migraines, secondary to a neck condition or TBI
Chronic headaches often trace back to a service-connected neck injury or to a traumatic brain injury. When a doctor connects the migraines to that primary, they can rate on their own, and frequent, prostrating migraines are rated meaningfully. One caution: headaches can sometimes overlap with a condition you are already rated for, and the VA will not pay twice for the same symptom. That is a conversation for your representative.
The pattern to notice
Every entry above follows the same shape: a service-connected primary, a medical chain, and a second condition at the end of it. When you look at your own health that way, the missed claims start to stand out. What did your service-connected condition go on to cause?
Why the nexus opinion is the whole game
A secondary claim without a nexus is just a hunch on paper. A nexus is a medical opinion, usually from a doctor, that states the second condition is at least as likely as not caused or aggravated by the service-connected one, and explains the reasoning. That phrase matters, because the VA decides close calls in your favor when the evidence is roughly balanced.
The opinion does not have to come from a specialist. It has to come from someone qualified who has reviewed your history and is willing to put the connection and the reasoning in writing. Without it, even an obvious link gets denied for lack of evidence. With it, the same claim can sail.
How to work this without overreaching
This is education, not medical advice, and none of these links is a guarantee. The honest way to use this list is simple. Read it, then look at your own service-connected conditions and ask what they may have caused or worsened. Take that short list to your doctor and ask, plainly, whether any of them are connected in your case. If the answer is yes, ask for it in writing.
Then take the whole thing to a free, VA-accredited representative before you file. A Veterans Service Organization will tell you which secondaries are worth pursuing, which might overlap with a rating you already have, and how to file them the right way. It costs nothing, and it is the difference between a clean claim and a denied one.
Where to verify this yourself
The secondary rule is written into the regulations, not left to a rater's mood. You can read it at 38 CFR §3.310, and the VA explains how it evaluates and pays claims, including Special Monthly Compensation, on VA.gov. If a condition you believe is secondary was left off your rating, that is worth raising with a free accredited representative.
Find the claims hiding in your own file
Upload your decision letter and the VA Claims Copilot will read your service-connected conditions in plain English, so you can see what each one might have gone on to cause. Then use it to map the secondaries worth taking to your doctor.
This is general education, not legal advice, and not from the VA. Your claim depends on your records, your evidence, and your exam. For advice on your specific situation, work with a free VA-accredited representative or a Veterans Service Organization. We are not the VA and are not affiliated with the VA.