You don't just get one, do you?

So now I have an exploded head to add to the list. It seems to be easing off slightly, which is nice. But it seems you'll rarely find someone with just one condition. Once you start the whole diagnosis process, it's the beginning of a collection.

Like collecting rare coins.

Only they're never as rare as you thought they were and they won't fetch a good price on Antiques Roadshow.