Trigeminal neuralgia type 1 is a rare disorder and we see about 5-10 new cases every 100,000 people. If you take a city like Tucson that has got about a million people, you're looking at 50-100 new cases each year. That may seem like a lot, but when you put that in perspective, that means any given primary care physician may go years without ever seeing a case, and so its rarity makes it sometimes very difficult to diagnose because people on the front lines don't see it that often.