Migraine claims are unusual in one respect: there is no imaging study or lab test that proves the diagnosis or measures its severity. Everything the VA evaluates comes from what is written down - treatment records, the veteran's reports over time, statements from people who witness attacks, and medical opinions. That makes documentation the deciding factor in most migraine claims.
This guide walks through what evidence actually addresses the questions the VA has to answer, and the gaps that most often weaken otherwise valid claims. For the underlying framework, see how migraine service connection works.
The two questions your evidence has to answer
Every migraine claim splits into two separate questions, and evidence that answers one does not necessarily answer the other:
- Service connection: is the condition related to service, or to an already service-connected disability?
- Rating: how frequent and how severe are the attacks, and what do they do to your ability to function and work?
Medical records
Treatment records are the backbone. What helps most is not a single visit but a consistent record over time.
- The diagnosis itself, from a provider who evaluated your headaches
- Notes reporting attack frequency at each visit - these become the record of your pattern over months and years
- Prescriptions for abortive and preventive migraine medications, including refill history, which indirectly documents frequency
- Emergency department or urgent care visits for severe attacks
- Imaging ordered to rule out other causes, which supports the clinical diagnosis by exclusion
- Service treatment records documenting headaches, head injury, or related complaints during service
The headache diary
A contemporaneous headache diary is one of the most useful pieces of evidence a veteran can create, and one of the most commonly missing. It directly addresses the rating criteria, which turn on how often prostrating attacks occur.
A useful entry records the date, how long the attack lasted, the symptoms, what you had to stop doing, and whether you missed work or other obligations. Keep it as you go - a diary reconstructed from memory after filing carries less weight than one maintained over months.
Lay statements
Lay evidence is competent to describe what a person observed. Spouses, adult children, coworkers, and supervisors can describe what they see: how often you disappear into a dark room, how long you are out of commission, what you cancel or miss.
The most useful statements are specific and factual. “He has migraines often” is far weaker than “Two or three times a month he has to leave the dinner table, close the blinds, and lie down for four to six hours, and he cannot be spoken to during that time.”
Where veterans start
Every case is different, and there is no obligation at any step. When veterans want to understand what their records actually support, these are the two most common starting points:
- Medical records review
A licensed physician reviews your records for a $250 flat fee and identifies which conditions the available evidence may support. The fee is refunded in full if nothing supportable is identified.
- Nexus letter
When the records support one, a licensed provider writes the medical opinion that addresses the link between your migraines and your service or an already service-connected condition.
Employment evidence
The 50 percent level requires attacks productive of severe economic inadaptability, so employment documentation becomes directly relevant at that level: attendance records, leave usage, written accommodations, disciplinary records tied to absences, or a statement from an employer describing the impact.
The medical nexus opinion
When the connection between migraines and service is not obvious on the face of the record - onset years after discharge, or a secondary theory - a reasoned medical opinion is often what addresses the nexus element. A useful opinion reviews the actual records, identifies the claimed pathway, explains the medical mechanism, considers competing causes, and states a conclusion under the VA's “at least as likely as not” standard.
An opinion that simply asserts a conclusion, or cites general literature without applying it to the veteran's history, carries far less weight.
Common evidence gaps
The patterns that most often weaken migraine claims are fixable:
- Self-treating at home for years, so treatment records show far fewer attacks than actually occurred
- No headache diary, leaving frequency to be reconstructed from memory at a C&P examination
- Reporting a good month at the examination without context, so the record reflects a temporary low point rather than the ongoing pattern
- Treatment records that document that headaches occur but never how often or how disabling they are
- A secondary theory with no medical opinion connecting the primary condition to the migraines
- Inconsistencies between what the diary, the treatment records, and the examination report describe
Where to start
If you are unsure what your records currently establish, that is the question a medical records review answers. A licensed physician examines the file for a flat fee and identifies what the evidence supports and where the gaps are, before any opinion is written. When the records support one, a nexus letter addresses the connection. There is no obligation at either step, and you are welcome to call and discuss your situation at no cost.