Volatile wrote:

You could be working out your shoulders too much(3 days a week), but your only doing 3 sets each time so it seems unlikely.

Soreness = normal. You need to make sure that soreness ceases before working that muscle group again.

Pain = you fucked something up. Take some time off. If it doesn't go away after a week, I would suggest making an appointment with your physician.

Out of curiosity, why are you only working out your shoulders and biceps?
I'm a rower and already have pretty big legs through sport so I decided to work my top half more

Also yes I am using free weights.

Cheers for the replies guys