Originally Posted by FBinNY

I've had an idiopathic heart issue since my early twenties (first time it was spotted). After seeing some specialists, it was determined that it was idiopathic and apparently not serious. The doc and I agreed that a good description was "rough idle", but otherwise I was OK.

He also defined "idiopathic" as it's used by medical pros as, "We don't know what's going on, or the cause. Apparently it's something unique to you, and we're not willing to admit we don't know exactly what it is".