What the rankings mean, where the evidence comes from, and why the app is honest about small numbers.
How trigger ranking works
For every migraine you log, Migraine Sentry compares the 48 hours before it with your normal weeks. Signals that keep showing up before attacks (short sleep, a falling barometer, high stress, caffeine withdrawal) climb the ranking. Every entry shows its real evidence: "Present before 12 of 15 migraines."
Rankings are grouped by strength (strong link, moderate link, worth watching), and every finding carries a research-backed evidence tier, so you can tell an established trigger from an exploratory one.
The unlock ladder
| Milestone | What appears |
|---|---|
| 3 logged migraines | First insights: emerging trigger ranking, timing facts, streaks, plus your morning forecast (once 7 days of health data have built your baseline) |
| 5 migraines | The full picture: confident rankings, timing charts, weekend patterns, sleep comparison |
| Ongoing | Severity patterns, trigger combinations, during-attack insights as your history grows |
Below 5 migraines, insights deliberately speak in counts ("before 2 of 3 attacks") rather than percentages, because a percentage from three data points would be noise dressed up as knowledge.
Reading the Insights tab
Insights open with what matters: a one-line takeaway like "Short sleep is your strongest signal". Every claim in "What we've learned" is tappable, jumping straight to its evidence. Four tabs: Overview, Triggers, Patterns, Treatment.