What: Dull ache that is quite painful when I push on the inside of my foot, feels like I blocked a slapshot with the inside of my foot. Specifically, the hard (Navicular?/medial cuneiform? see link below) bone above my flat arch, about midway between heel and toe. It is the portion of the foot that seems to extend furthest medially, toward the centerline of my body, but not the round pointy ankle bone (being technical here). Icing does not seem to get much relief compared to soft tissue issues. Definitely on the side of the foot, not on the bottom.
When: I feel it when standing, especially after I wake up and after sitting for long periods, but not running. I can run for 2 hrs+ no issue; its just sore afterwards. Walking is bearable after a first few hobbles.
Why: I'm concerned its a stress fracture due to my elite Googling skills and Internet Diagnosis degree. Basically, my layman's interpretation of what I'm feeling. I do not have history with stress fractures, only severe ankle sprains.
History: My running background, I am 6'1", 176 lbs and been focusing on only running with two new kids in the last two years. I run 6x/wk 40-50 mpw consistently, year round (my times say otherwise). I have been focusing on ultra marathons the last few years and have 4 (50k-50mi) in 12 months under my belt with no injuries. My shoe of choice is Mizuno Wave Elixirs 3-6 and on my 11th pair. I use black superfeet as my insole. I used a Rx insole for years before ditching them slowly for SF last year (and did a 50mi since). I'm fashionable since I strike midfoot quite naturally despite my what flat arches would indicate if I heel struck.
I first started feeling the pain after a mtb ride after little/no mtb. Figured it was my mtb shoe being too tight; and I crashed once so thought I may have bruised it against the crank. It is obviously not keeping me from running, but just painful after the runs and I'm worried I am going to do more damage if I continue. During my recovery weeks and running 3x/wk the pain is substantially less. I am doing a training marathon in a few weeks I don't care about, but doing a 88k in June and a 98k in Aug.
Thanks for any insight, let me know if I can clarify anything.