For four or five months now my shoulders (anterior delts in particular) have been perpetually sore. They are not sore like they would be the day after a workout, instead, if I contract the muscles for more than a few seconds at a time I feel an intense lactic acid buildup type burning sensation. I first noticed this several months ago when I was blow-drying my hair (I used to have long hair), and just holding up the hair dryer caused a lot of pain. This pain hasn?t effected me much at the gym, because I?m contracting the muscles for shorter periods at a time, but again, whenever I have to hold something for a longer period of time it hurts pretty bad. Has anyone else experienced anything similar?