Pain above big toe any idea what it might be?

I been trying to find something but all I get is turf to which it might be I been strating to run again to train for the chicago marathon and have been putting in about atleast 5 miles a day some days more and take sundays off one day while running the upper I guess you can say joint it feels like it's on top of my big left toe it's not where it bends but right above that where iy connects to the foot I thought it might be the shoes were to tight I loosed them and it's still there there is no color or and noticeable looks to it the pain is not unbarrable just don't want to keep running on it and have something bad happen anyone have any ideas what it mightbe and how to treat it if is what you say?