Probabilities are not physical laws of the universe. A disease having a 0.01% chance in no way is an actual measure of you having or not. If everyone with cancer wrote it off based on probability many more people would go undiagnosed
I guess I should go further and suggest actually exposing conditional probabilities & flow charts, which is essentially how a lot of GPs triage diagnosis.
If you have these additional symptoms, it rules out X, and conditional probabilities are now Z..
If you tried a warm compress/ibuprofen then it rules out Y and your now looking at these probabilities.
Etc.
Right now you google stuff and get a WebMD page with a list of stuff varying from "its nothing" to "its cancer" without a lot of color ..
