I've been running for years, have done a few marathons, last one was 4 years ago and lots of halfs. I have been through a LOT of different shoes. I also trail run which requires grippy shoes for different conditions.
The problem I am having more recently is when I do anything over 10 miles, no matter which shoe I choose, different parts of my feet hurt! I did a half this weekend, which was trail, so I wore my most comfortable trail shoes (La Sportiva Mutant) and by the last few miles my big toe was very sore (I think it was banging the end of the shoe and they are definitely not too small) and my other foot hurt on the sole, just below the toes. Could I have an ingrowing big toenail possibly?
I get no pain when walking or running less mileage, so it's very frustrating as I do want to do long runs without niggles!