Can Major Depressive Disorder be service-connected as secondary to Fibromyalgia?

It can be claimed that way. Under 38 CFR § 3.310, a condition that is proximately due to — or aggravated by — an already service-connected disability can itself be service-connected. Whether VA grants it depends on the evidence in your file, and the decision is made solely by VA adjudicators.

Do I need a nexus letter for a secondary claim?

In most cases yes. The rater needs a medical opinion connecting the two conditions at the "at least as likely as not" (50% or greater) standard. That opinion has to come from a licensed clinician who reviews your records and signs it — a draft is a starting point for that provider, not a substitute for their judgment.

Secondary service connection

Major Depressive Disorder Secondary to Fibromyalgia

If VA already rates you for Fibromyalgia, major depressive disorder can be claimed as secondary under 38 CFR § 3.310 — you do not have to prove it started in service.

Start with Major Depressive Disorder All secondary connections

Already rated

Fibromyalgia

Service-connected

The claim

Major Depressive Disorder

Secondary · 38 CFR § 3.310

What the claim needs on paper

A current diagnosis: Major Depressive Disorder
Your service-connected Fibromyalgia
A medical opinion linking the two — “at least as likely as not”

The medical link

The chronic widespread pain, fatigue, and functional impairment of fibromyalgia share neurobiological mechanisms with depression and frequently trigger depressive episodes.

What proves it

Mental health records; rheumatologist or psychiatrist nexus letter linking central sensitization from fibromyalgia to co-occurring major depression.

The rule VA applies

38 CFR § 3.310 covers secondary service connection two ways: a condition caused by a service-connected disability, and one aggravated by it beyond its natural progression. Either route works, and a claim can argue both. The standard is “at least as likely as not” — a 50% probability, not proof beyond doubt.

You do not need to show major depressive disorder began during service. That is what makes a secondary claim different, and it is the step most veterans do not realise is available to them.

What this becomes

Build the documents for this claim

Tell us what's going on in your own words and we'll draft the nexus letter for your provider to review and sign, plus your personal statement and buddy statements.

Start with Major Depressive Disorder

Obstructive sleep apnea DC 6847

Your fileBuilding · 3 of 4

This claim needs: a nexus opinion.

1 · The diagnosisOn record — the VA already conceded it
2 · What happened, and how it affects youYour statement · daily life · a witness
3 · The link to your serviceReady to draft — this answers the denialDraft it →

How VA rates it — your records document the 50% level.

“Patient uses CPAP nightly, compliance 92% of nights.” — sleep study, p. 3

A demo claim, not a customer's — every claim is laid out this way. VA decides every claim.

Straight answers

Common questions

Can Major Depressive Disorder be service-connected as secondary to Fibromyalgia?: It can be claimed that way. Under 38 CFR § 3.310, a condition that is proximately due to — or aggravated by — an already service-connected disability can itself be service-connected. Whether VA grants it depends on the evidence in your file, and the decision is made solely by VA adjudicators.
What is the medical link between Fibromyalgia and Major Depressive Disorder?: The chronic widespread pain, fatigue, and functional impairment of fibromyalgia share neurobiological mechanisms with depression and frequently trigger depressive episodes.
What evidence do I need?: Mental health records; rheumatologist or psychiatrist nexus letter linking central sensitization from fibromyalgia to co-occurring major depression.
Do I need a nexus letter for a secondary claim?: In most cases yes. The rater needs a medical opinion connecting the two conditions at the "at least as likely as not" (50% or greater) standard. That opinion has to come from a licensed clinician who reviews your records and signs it — a draft is a starting point for that provider, not a substitute for their judgment.

Keep going

Other conditions secondary to Fibromyalgia

Veterans rated for Fibromyalgia often have more than one of these.

Rated for more than Fibromyalgia?

Pick what you're rated for → see what commonly follows.

The free finder maps the secondary conditions that commonly follow every condition you already have — not just this one. No sign-up to look.

Could I qualify for more?

Start with the records you have.

Upload what you've got. We'll show you what it proves for Major Depressive Disorder and what to do next.