First Time Poster ~ Sharp Pain Upper Right Flank / Behind Armpit

Brief history ~ 55 yr old male retired 5 years ago, due to knee problems (DJD) ~ am taking Relefen for knees & Accupril for mild hypertension.  Quit smoking & drinking about 15 years ago ~ cholestrol is a little high, am overweight ... but other than that I'm relatively healthy i.e., heart/blood sugar, etc.

To the point, a couple days ago I had a sharp searing pain in my upper right backside ... flank ... a few inchesbelow & behind my right armpit.  No visable sign of anything, no lump, no rash ... nada.  Pain is intense, but goes away quickly, does not linger.  Pain felt when I stretch right arm to do normal everyday chores, and also when I try to sleep on my right side.  To my knowledge there are no vital organs in this area ... kidney & liver lower in torso?  If I had to describe pain, I would say it feels like a knife wound...like a slash or tear in flesh ... but there is nothing visable, nor have I done anything physically strenuous to tear muscle or skin.

Thanks for any advice.  I have made appointment with my doctor, but appointment is not for a couple weeks yet.

[amberch]

could easily be tendonitis- most likely subscapularis tendinitis
or any injury to the muscle tendons or ligaments