I am a fit person who walks regularly but recently I have been getting pain with each step on the underneath of my heel, mainly on the outer side. Any ideas please as to what it might be ?
You sound like you may have plantar facilitus. I had the problem for about 18 months and it wouldn't go away even after trying heel inserts etc. In fact the method that worked in the end were those elasticated ankle grippers that stretch from your toes to the bottom of the leg and the pain got better soon after. They cost about £5/pair.
Thankyou both so much, have looked it up and certainly sounds like that. I cannot take ibuprofen as I have kidney disease but will find another pain killer and get the ankle support.
Massage your instep using a hard rubber ball. It will hurt a lot but after a few sessions the pain will go away. Insoles aren't worth the money, you need to fix yourself.