You’ve been told it’s rare. Or you’ve been told it’s nothing.
If it feels life-threatening, call 911 now.
Most conditions called rare are really just rarely recognized. The signs are often already in tests you’ve had. This is a free, plain-language guide to finding them, and to asking the question that gets you seen.
“In a certain way, the body is truly a myriad of feedback loops. That’s the control system. And those feedback loops comprise a complicated Venn diagram. It turns it from a medical discussion into an engineering systems discussion.”
You can talk with me. Like you would with a friend. →
Where would you like to start?
- I have a diagnosis, or I suspect oneGo straight to its chapter.›
- Something is wrong, and no one knows whyAnswer a few questions and see where they point.›
- I have test results I don’t understandFind the early warnings that may already be in them.›
- I have an appointment coming upMake a short visit count.›
- Health insurance: choosing well and getting to yesA plain-language guide to choosing coverage, understanding a denial, and appeals.›
Reading is private
No accounts, and nothing you read or type on these pages is sent anywhere.
Every claim shows its evidence
Numbers carry a grade and a source. Where our own methods are still being tested, we say so.
Hints, never verdicts
We help you ask a sharper question. Why we built this, and what we promise
Conditions in the book
Grouped by the part of the body they mostly affect. Many reach further, and each chapter shows where. Chapters with the most depth · See where they overlap