Learn how to analyze migraine diary data to spot patterns, identify triggers, and track severity trends so your next appointment is more productive.
Knowing how to analyze migraine diary data is the single skill that turns a stack of daily logs into something actually useful. Raw entries sitting in a notebook or an app mean nothing until you step back and look for signal in the noise. This guide walks you through exactly how to do that, from counting the right kind of days to building a picture you can bring to your next appointment.
This distinction gets glossed over constantly, and it costs people real clarity.
A migraine day is any calendar day where you experience an attack that meets migraine criteria. That usually means moderate to severe head pain accompanied by at least one of the following: nausea, vomiting, sensitivity to light, sensitivity to sound, or pain that worsens with physical activity. One attack per day, regardless of how many hours it lasts, equals one migraine day.
A headache day is broader. It includes any day with head pain, even tension-type or mild discomfort that does not rise to migraine level.
Why separate them? Because most clinical thresholds (including those used for CGRP therapy eligibility and response assessment) are based on monthly migraine days, not total headache days. If you are only counting "bad head days," you may be undercounting or overcounting in ways that obscure your actual pattern. Start there. For a deeper look at how monthly counts work, see monthly migraine days.
Once you have two to three months of clean data, lay it out visually if you can. A simple calendar grid works. Mark migraine days in one color, headache days in another.
Look for clusters first. A cluster is three or more migraine days bunched together within a short window. Some people attack in predictable multi-day runs. If yours do, note what precedes the cluster, not just what happens during it.
Then check day-of-week distribution. Common patterns include:
If a day-of-week pattern shows up across two months or more, it is worth naming. It changes how you plan and what you flag for your provider.
This is where most people get frustrated, because the data rarely gives you a clean "X causes Y." Triggers are cumulative and contextual. The goal is not certainty. It is probability.
Go through your log and tag each migraine day with what was present in the 24 to 48 hours before onset. Common categories to track:
After two to three months, count how often each factor appears before a migraine versus how often it appears on attack-free days. A factor that shows up 80% of the time before attacks but only 20% of the time otherwise is a meaningful signal. A factor that appears equally on both kinds of days is probably noise.
For more on building an accurate, structured log that makes this kind of review possible, how to track migraines accurately covers the fundamentals.
A migraine diary that only records yes/no misses half the picture. Severity scores tell you whether your attacks are getting worse, better, or staying flat, even when the frequency number stays the same.
Use a consistent 1 to 10 scale or a simpler 1 to 3 scale (mild, moderate, severe) and apply it the same way every time. The specific scale matters less than using the same one throughout.
Once you have monthly data, calculate a simple average severity score per month. Then compare across months. A few things to watch for:
Also track attack duration. Note when an attack starts and when you return to full function, not just when pain peaks. Duration trends over time can matter as much as severity scores.
Your clinician has limited time. If you walk in with three months of raw entries, you are offloading the analysis work onto them. Instead, prepare a one-page summary with:
If you are tracking CGRP therapy specifically, bring your pre-treatment baseline and your post-treatment data together. Measuring CGRP progress explains how to structure that comparison so it lands clearly in an appointment.
The goal is to walk in having already done the analysis, so the conversation can be about next steps rather than data entry.
Migraine Tracker: CGRP Log handles the heavy lifting here automatically. As you log daily, the app builds the charts, calculates your monthly migraine day counts, and generates clinician-ready summaries and renewal reports you can share directly from your phone. Instead of spending the night before an appointment reconstructing months of entries, you show up with the analysis already done.
Educational, not medical advice. Migraine Tracker: CGRP Log is a personal tracking tool, not a medical device. It does not diagnose, treat, or provide medical advice. Always talk to your clinician.
A migraine day is one where your headache meets migraine criteria (usually moderate to severe pain, plus nausea, light sensitivity, or sound sensitivity). A headache day covers any head pain that does not meet that threshold. Separating them matters because treatment decisions and CGRP therapy targets are based on migraine days specifically, not total headache days.
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