Seeing as I was born with a stupid chest, I feel like I can post on this. Hope you don't mind ladies.
For me it was a dull yet constant pain. However, when I touched them too hard or something accidentally hit them, the pain was sharp. They were also very tender, especially around the base and the nipple. I also experienced some bruising or dark coloration around the nipple but that only lasted a few days and wasn't anything too serious.
Hope that helps. xD