I had two come in before all of my adult teeth. Two others were impacted and below the gum. One of them would burst through the gum, then the gum would grow back over it and repeat. Never really bothered me until, what I assume food or whatever got caught in it as the gum grew back and caused a VERY PAINFUL INFECTION HOLY FUCKING HELL. There wasn't enough room for my wisdoms, either.
If they are growing in and pushing your teeth together, get them removed. I had my 4 removed at 3 different times. I used pain killers once and it was due to a dry socket and then I only took them for a day. The other times I didn't take any. I don't see why everyone's such a pussy about it. On top of that, my teeth freak out every dentist I've been to. Apparently, less than 5% of the population have roots as big/long as mine. I've never had a tooth pulled that didn't take a ridiculous amount of effort on the denstist behalf.
If you can, have them put you under if you're worried about it. I was put under once and it was fuckin great. Woke up thinking they still had to get started. Not to mention, I was told I was being pretty damn funny before it finally knocked me out. I barely remember, but I do remember how nice it was. lol