A headache diary sounds simple. It is, in practice, one of the most powerful pieces of evidence a veteran can produce for a migraine VA claim. The key is knowing what information actually matters to the rater and recording it in a way that maps directly to the rating criteria.
The VA rates migraines under Diagnostic Code 8100 based on how often prostrating attacks occur over "the last several months." The rater has no way to independently verify your attack frequency. They can read your medical records, but most veterans don't go to the VA or urgent care for every migraine. The diary fills that evidentiary gap.
A well-kept diary converts your lived experience into credible, organized data. It is harder to dismiss than verbal statements and more specific than retrospective estimates.
Every entry should include:
Record when the attack began. Exact time is better than approximate. This helps establish the attack's duration and allows the rater to cross-check against any dates you sought treatment.
Note when the headache resolved or substantially improved. Duration matters because it establishes the severity of functional impact. A 30-minute headache and a 14-hour headache carry different clinical weight.
Use a 1-10 numeric scale. Record the peak severity during the attack, not just where it started. An attack that builds to an 8 or 9 is more likely to be prostrating than one that plateaus at a 4.
Note every associated symptom you experienced:
These symptoms distinguish migraines from tension headaches and contribute to the clinical picture the examiner uses to make the diagnosis.
This is the most important field for rating purposes. Describe specifically what you had to stop doing:
The prostrating standard requires that attacks force you to stop normal activity. Your diary is where you prove it.
Record what you took and whether it helped. Note:
Medication response is clinically relevant. Attacks that respond partially to triptans but still require several hours of rest are still prostrating. Attacks that don't respond at all demonstrate severity.
If you can identify a trigger, note it. This is especially useful for secondary claims. If PTSD-related hyperarousal, poor sleep from sleep apnea, or neck pain from a cervical spine condition reliably precede your attacks, documenting that pattern builds the nexus case. For the PTSD connection, see Migraines secondary to PTSD: the research-backed pathway.
The format doesn't need to be elaborate. Options include:
Whatever format you use, consistency matters more than elegance. An imperfect daily log kept for six months is more persuasive than a polished document covering two weeks.
Starting the diary too late. The rating schedule references "the last several months," interpreted as three to six months. Start now, not the week before your C&P exam.
Only logging severe attacks. Log all headaches, but clearly mark which ones were prostrating and which were mild. The rater needs to see the full picture, including the fact that you distinguish severe from mild.
Vague functional impact notes. "Felt bad all day" is less useful than "Could not work from 10 a.m. to 6 p.m., lay in dark room, vomited twice."
Inconsistency with medical records. If your diary says you had a prostrating attack on a Tuesday but your medical records show you worked a full shift with no sick call, there's a discrepancy. Accuracy is essential.
Bring your diary to the exam. Ask the examiner if they want to review it or if you can summarize from it. When they ask about frequency, refer to specific months: "In February I had three prostrating attacks, in March I had two, in April so far I've had one." Specific numbers from a written record are more credible than general estimates.
For the broader documentation picture, see How to document migraine frequency for a VA claim.
Flat Rate Nexus provides physician-signed nexus letters and free tools to help veterans build stronger migraine claims at flatratenexus.com/migraines.html.
Thinking about your own claim? Every nexus letter we write goes through a full physician record review, cites peer-reviewed research, and is built around the actual evidence in your case.
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