I would definitely go see a doctor to be safe. The years of running may have very well just taken their toll. My knees have symptoms similar to what you're describing, but ended up being a combination of problems including hardened tissue (plica), and osteoarthritis (even though I am only in my teens) after years of a particular sport. The fact that the pain doesnt travel up the leg at all and is isolated to one foot does offer the possibility of a fracture. Has there been any swelling/inflamation in the foot or any other areas as of late?
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