Few moments in the VA process hit harder than opening a decision letter that says "denied." You served, you are hurting, and the system just told you no. But here is what many veterans do not realize: a denial is often not the end. A large share of denied claims — by various estimates, more than half — are overturned later. The reason is simple. Most denials happen for a small set of specific, fixable reasons. Once you know which one applies to you, the path forward gets much clearer.

First, Read Your Decision Letter

Before anything else, find the section of your decision letter labeled "Reasons for Decision." That is where the VA spells out exactly why it said no. If you filed for more than one condition, each one may have its own reason. Pinpointing the exact gap is the whole game, because the fix depends entirely on the reason.

The Most Common Reasons VA Claims Get Denied

Most denials trace back to one of these:

• Not enough medical evidence. This is the single most common reason. The VA did not see enough records, test results, or treatment history to support the claim.
• No clear connection to service. You may have a current diagnosis and a documented event in service, yet nothing ties the two together. This missing link — the "nexus" — sinks a huge number of otherwise valid claims.
• No current diagnosis. The VA needs a current, diagnosed condition. A history of symptoms alone, without a formal diagnosis, often is not enough.
• A missed or unfavorable C&P exam. Skipping a Compensation and Pension exam almost guarantees a denial. And even if you attended, the examiner's opinion may have gone against you.
• Missed deadlines or paperwork. Filing late or with incomplete forms can stop a claim before the evidence is ever weighed.

Where a Nexus Letter Fixes the Problem

Here is the honest part, because not every denial is fixed the same way.

A nexus letter solves one specific problem: the missing connection to service. If your claim was denied because the VA did not believe your condition was linked to your service — or because a C&P examiner's opinion went against you — a strong, independent nexus letter speaks directly to that gap. It provides a qualified medical opinion that your condition is "at least as likely as not" related to your service, with the reasoning to back it up. (New to the term? Here is what a nexus letter is.)

What a nexus letter cannot do is fix a purely procedural denial, like a missed deadline, or stand in for a diagnosis you do not yet have. So the first step is always matching the tool to the reason. If your denial was about the connection — and many are — that is exactly where a nexus letter earns its place.

The same is true for secondary conditions, where the link between one service-connected disability and another is the very thing in question.

It's also worth knowing that the legal standard for secondary claims changed in 2026. As of May 1, 2026, nexus letters for secondary service connection must satisfy a "but for" causation standard — see The VA Changed the Rules on Secondary Claims: What the New 'But For' Standard Means for Your Nexus Letter (2026) for the details.

Your Options After a Denial

If your claim was denied, you generally have three paths, and choosing the right one matters:

1. Supplemental Claim. You submit new and relevant evidence the VA has not seen before — a nexus letter, an updated diagnosis, or new records that directly address the denial reason. This is usually the right lane when the problem was missing evidence. (VA Form 20-0995.)
2. Higher-Level Review. A senior reviewer takes a fresh look at the evidence already in your file. You do not add new evidence here. This fits when you believe the VA misread or overlooked what you already submitted. (VA Form 20-0996.)
3. Board Appeal. A Veterans Law Judge reviews your case. This is the most thorough path, but also the slowest, often taking a year or more.

One deadline matters above all: filing within one year of your decision generally preserves your original effective date — and with it, your back pay. Filing later can reset that date and cost you money. You can read the VA's own overview of decision reviews and appeals for the details, and a VSO or accredited representative can help you file the appeal itself at no cost.

The Bottom Line

A denial feels final, but for most veterans it is not. The key is to read your letter, identify the exact reason, and answer it with targeted evidence — not a frustrated rebuttal, but the specific piece the VA said was missing. When that missing piece is the connection between your condition and your service, a strong nexus letter is often what turns a "denied" into an approval.

If your denial came down to that missing link, you can see how our process works or read how other veterans turned their claims around.