I went on Hurtigruten in December 2016, and I agree it was the trip of my lifetime!

At least on my cruise, we had to provide a written form signed by my doctor saying I was healthy enough to be in that situation where help would be difficult and expensive. They took this very seriously, the ship’s doctor initially had a fit because I accidentally handed him a photocopy instead of the original. I’d assumed that was standard, but maybe not. Of course it doesn’t prevent a medical event from happening, and I’m sure there have even been cases of forgery!

If you go, read up on the impacts of going early and late in the season. Both have advantages, but you may prefer one over the other!