I am a regular runner of 20 years and have never experienced any kind of foot pain before. In the last few weeks I have experienced a discomfort that has gotten progressively worse. The source of pain seems to be coming from the inside of my foot, at the very back edge or just behind the large joint of my big toe. I sense this could be a tissue issue, but I don’t know enough foot anatomy to know if this is even a possibility. After a 9.5 mile run today it is difficult to walk unless I put stepping pressure on the outside of my foot. Any thoughts of what this could be as well as treatment suggestions would be greatly appreciated.