I've posted this elsewhere as well, but wouldn't mind a medical insight too. About 3-4 weeks ago I did a tempo run, HR controlled to 160, 10km total distance inc warmup/cool down, so no further than usual. I think it was the next day I noticed increased pain in my left big toe at the joint with the foot. I say increased, beacause I have had similar pain before, in isolated episodes but this is by far the worst. There is no pain on just sitting doing nothing, or on curling the toes downward, but there is on flexing the toes. The pain is then in line with the tendon running from big to to ankle area with a feeling I can only describe as "creaking". There is no swelling, and otherwise no localised tenderness, so I think stress fracture unlikely. Yesterday on my 30km run in NB minimus trail 00, it was fine until about 18-20km, then started hurting, and today its as described, but with less pain. It does seem to be getting less painful over time. Question is, is there specific cause likely, other than an acute sprain/strain, is it likely to be anything more than a tendon strain/sprain and is there anything I can do to speed up recovery. I've not taken any anti-inflammatorys preferring to let the bodies own mechanisms have their chance.