I have been suffering from the same problem. I recently started playing basketball and I strained the tendon on the bottom of my foot. It hurt for a couple of days and then the pain went away. Now when I walk my injured tendon will "pop" right in the center of my arch. It doesn't hurt as much as it is just uncomfortable. I tried resting it but it seems to give me more trouble when I sit down for a long time and then start walking. I hope someone has a remedy because it is very annoying.