Symptom-based red flags this guide can't substitute for
9 sections · Updated July 2026 · 3 sources cited
All sections
The honest rule of thumb
Treat as cardiac until proven otherwise — in both sexes
FAST, its blind spot, and why timing matters
The remaining red flags that shouldn't wait
A more reliable red flag than it's often given credit for
Book, don't self-diagnose
Key sources behind this guide — linked directly to the source where available
Concise definitions for terms used throughout this guide