Upper Thigh Pain from running?

I am having some relatively strong pains in my upper thigh, on my left side only. It is hard to explain but I would say the right side of my upper left thigh. It is basically sore throughout the day, and just for the beginning 30 seconds or minute of my runs, and than it subsides for the rest of the run, but... show more I am having some relatively strong pains in my upper thigh, on my left side only. It is hard to explain but I would say the right side of my upper left thigh. It is basically sore throughout the day, and just for the beginning 30 seconds or minute of my runs, and than it subsides for the rest of the run, but returns strongly after the run. I'm confused to what it could be, as I have been dealing with it for a week or two hoping that it would settle down, but it hasn't seemed to. The pain is worst when getting up from a sitting position, and after I run.
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