Depression secondary to migraines: nexus letters
Nexus Letter Insights
Depression secondary to migraines: a veteran’s guide to the VA claim
By Jessica R. Allen, M.D. — Psychiatrist & former VA C&P examiner · July 2026
If you would like to discuss your case with Dr. Allen, please call our office at (919) 849-8617 or book a free phone consultation.
If service-connected migraines have worn you down to the point that a dark, persistent low mood has set in, you are not imagining the connection—and you may be able to claim it. Depression that is caused or worsened by service-connected migraines can be service-connected in its own right, on what the VA calls a secondary basis. This guide walks through how that works: whether migraines can cause depression, how a depression nexus letter proves the link, and how the claim is rated.
The short version: If your migraines are already service-connected and you now have diagnosed depression, you can file a secondary claim. Winning it comes down to a nexus letter—a medical opinion explaining that your migraines at least as likely as not caused or aggravated the depression.
Can migraines cause depression?
Yes—and the relationship is well established in the medical literature. Migraine and major depression are strongly comorbid, and the influence runs in both directions: having migraines raises the risk of later developing depression, and depression raises the risk of developing migraines. In a landmark study, migraine predicted the first onset of major depression, and major depression predicted the first onset of migraine. Longitudinal community research has since confirmed that people with migraine are significantly more likely to develop a major depressive episode over time.
Why? Living with a recurrent, disabling pain condition takes a real psychological toll. Chronic and unpredictable migraine attacks disrupt sleep, derail work and relationships, and force a person to give up activities they value—all well-recognized drivers of depression. There is also shared biology: migraine and depression involve overlapping brain systems, including serotonin pathways, which is part of why the two so often travel together. For a veteran, the daily grind of managing service-connected migraines is precisely the kind of burden that can tip into a diagnosable depressive disorder.
Can I get VA disability for depression caused by migraines?
Yes. This is a secondary service connection claim. Under the VA’s rules (38 C.F.R. § 3.310), any condition that is caused or aggravated by a service-connected disability can itself be service-connected—and receive its own rating. So if your migraines are already service-connected and they have caused or worsened your depression, the depression can be added to your VA disability claims as a secondary condition.
The advantage of a secondary claim is that you do not have to prove your depression started in service. That link is made through the migraines, which are already established as service-connected. You are connecting the dots from an accepted disability to a new one.
How do I prove depression is secondary to my migraines?
A secondary claim for depression rests on three things:
- A current diagnosis of depression (major depressive disorder or another depressive disorder), from a qualified provider.
- Your migraines already service-connected by the VA.
- A medical nexus linking the two—an opinion that your migraines at least as likely as not (a 50% probability or greater) caused or aggravated your depression.
That third element is where most claims are won or lost, and it is what a nexus letter provides. Note the word aggravated: even if you had some depression already, if service-connected migraines made it meaningfully worse, that worsening can be service-connected too.
What is a nexus letter—and what makes a strong one?
A nexus letter is a written medical opinion that connects a condition to service (or, here, to another service-connected condition). For depression nexus letters, a persuasive one does more than state a conclusion. It:
- Confirms the depression diagnosis and reviews your specific history;
- Explains the mechanism—how your particular experience of migraines led to or worsened the depression;
- Uses the VA’s standard of proof, stating the link is “at least as likely as not”; and
- Grounds the reasoning in the medical literature on migraine and depression.
A letter that simply asserts a connection carries far less weight than one that reasons its way there. The strongest depression nexus letters read like what they are: a careful clinical argument an adjudicator can follow.
Wondering whether your depression qualifies as secondary to your migraines?
How much VA disability is depression secondary to migraines worth?
Once service-connected, depression is rated from 0 to 100 percent under the VA’s General Rating Formula for Mental Disorders (38 C.F.R. § 4.130), based on how much it impairs your work and social functioning—not on the fact that it came from migraines. Common levels are 30%, 50%, and 70%. For a breakdown of what each level means, see our guide to VA disability ratings for mental health conditions.
One point that surprises many veterans: your depression rating does not simply add to your migraine rating. The VA combines ratings using its own math (the “combined ratings” table), not straight addition. Still, a successful secondary claim can meaningfully raise your overall combined rating. As always, the physician documents the severity; the VA assigns the percentage, and no letter can promise a specific outcome.
Depression secondary to headaches vs. migraines—does the type matter?
The research link is strongest and most direct for migraine specifically. But veterans are service-connected for a range of headache conditions, and depression secondary to headaches of other types can still be claimed. Chronic tension-type headaches and other persistent headache disorders carry many of the same burdens—ongoing pain, disrupted sleep, lost function—that drive depression.
What matters for your claim is the same in every case: a current depression diagnosis, your headache condition already service-connected, and a nexus opinion tailored to your diagnosis and history. The medical rationale should be honest about how strong the link is for your particular headache condition rather than overstating it.
Why the right doctor matters here
Depression is a psychiatric diagnosis, so a depression nexus letter carries the most weight when it comes from the specialty (psychiatry or psychology) that owns that diagnosis. Dr. Allen is a psychiatrist, which means an opinion on whether migraines caused or aggravated your depression is a specialist’s assessment, not a general one. She is also a former VA Compensation & Pension (C&P) examiner, so she knows how these claims are evaluated from the inside—what a rater needs to see, and how a nexus opinion must be reasoned to hold up. That combination is uncommon among the doctors who write nexus letters.
Frequently asked questions
Is depression a secondary condition to migraines?
It can be. When service-connected migraines cause or aggravate a diagnosed depressive disorder, that depression can be service-connected on a secondary basis with a supporting nexus letter.
Can I claim depression if my migraines are already rated?
Yes—that is exactly the situation a secondary claim is built for. Because your migraines are already service-connected, the claim only needs to show that they caused or aggravated your depression.
Do I need a nexus letter for depression secondary to migraines?
It is not strictly required, but the medical link is usually what these claims turn on. A well-reasoned nexus letter is often the difference-maker.
Can a nexus letter guarantee my VA claim is approved?
No. No physician can promise an outcome; the VA decides. A strong, well-supported letter improves the basis for a favorable decision, but it is one part of the record.
Sources
The bidirectional link between migraine and major depression is documented in peer-reviewed research, including:
- Breslau N, Lipton RB, Stewart WF, Schultz LR, Welch KM. Comorbidity of migraine and depression: investigating potential etiology and prognosis. Neurology. 2003;60(8):1308–1312. doi:10.1212/01.WNL.0000058907.41080.54. PMID: 12707434.
- Modgill G, Jette N, Wang JL, Becker WJ, Patten SB. A population-based longitudinal community study of major depression and migraine. Headache. 2012;52(3):422–432. doi:10.1111/j.1526-4610.2011.02036.x.
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If service-connected migraines have led to depression, Dr. Allen can review your records and discuss whether an independent medical opinion would support a secondary claim.