I would have a similar pain AFTER rides (down my left side). It actually felt like it was running through "the boys" to the point that I went to see the doc. I found anti-inflammatories (sp?) useful. Ultimately it went away with a lot of miles and some adjustments to seat high and level.
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2014 Specialized Roubaix2003 Interloc Impala2007 ParkPre Image C6 (RIP)