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[–]Arve 3 points4 points ago

See a doctor:

  • Plantar Fasciitis is very much associated with heel/arch pain in the morning when first standing. Since you're not mentioning this, I'll assume that this is not happening. Therefore I think PF is unlikely.
  • You're also saying that the arch pain appears a while into your run, sometimes to then disappear, which also seems inconsistent with PF.
  • It getting better when you rest, and then reappear within a few days of running also seems inconsistent.

Why see a doctor?

  • You have worked up to consistent 40-mile weeks in 13 months. 40 mpw is a danger zone for too-much-too-soon (TMTS) injuries. Doubly so, since you are doing speedwork consistently
  • Your injury is on one foot. PF, I think, more often occur in both (without being 100% certain, I could find very few references on this).
  • Acute pain while running and the TMTS makes you a prime candidate for stress fractures - something I also think is not inconsistent with your symptoms. Caveat: I'm not a medical professional in any capacity, but I know how to Google, and this page seems to agree it's on the list of possible causes. A stress fracture is absolutely not a DIY-er.

Should you choose to ignore my advice, here are some things which helped me, as a forefoot striker, with arch/heel pain symptoms:

  • Golf ball massage of the foot
  • Trigger point massage and stretching of my calf. Like thecoyote5, I'm no big fan of stretching, but I think it makes sense for forefoot runners.
  • The same for anything around my ankle, including my Achilles.
  • Compression socks - after running. In my case, my symptoms completely vanished within a few days, and haven't reappeared.
  • Shoes. For a good while, I ran in Mizuno Wave Ronins and Saucony Kinvara. I'm suspecting that the Kinvaras are to blame for some of the problems I had. I've since mostly switched to running Inov-8 f-lite shoes. Either way - get properly fitted for shoes - at a place which will film you with a high-speed camera on a treadmill to analyse your gait (and your foot).

TL;DR: See a doctor. While I'm giving a bit of self-help hints at the bottom, I'm posting those merely as things to try while you wait for your doctor's appointment.

[–]runconmigo 0 points1 point ago

Thanks alot for your input! I never considered a stress fracture. I'm definately gonna have to check with a sports med physician.