I was taking part in the Edinburgh 10K today. About 8K in to the race I got horrible sharp pains in the sides, and at the back, of my right heel. Sore enough to cause me to quit the race.
The pain didn't go into my arches, and I don't do a huge mileage. On average I run around 4 or 5 miles a week.
Any ideas what it might be, or how to cure it?

