depends on what was causing the pain in the first place. Was it due to working on the bag?
also: how heavy is the bag you train on? A superheavy bag, like say, over 100 pounds, is more likely to hurt your wrists if you don't wrap, esp. for techs like punches where you are drilling in and putting that kind of stress on the wrist. A lighter bag, like around 50 or 60 pounds, is more forgiving on the wrists, but if you are a bigger person, like over 160 pounds, it might not be heavy enough for you to get your full potential from it, esp. if you train kicks.
I used to train on a 65 pound or so bag, but I replaced it recently because it is canvas and always ripped up my knuckles. I recently got a leather bag, a bit heavier at 80 pounds. I weigh a bit over 150, and stand about 5'10", so I'm not a really big guy by a long shot, but I'm not a little guy either. I can tell a big difference between the two bags, and I have to start a bit easier on the heavier bag. And it's definitely heavy enough to give me a good time with my kicks. I almost got a 100 pound bag, and to tell the truth, I'm glad I didn't. I think it would be a bit much, esp. because my wife also trains and she's pretty small. The new 80 pounder is probably pushing her limits, but it's a good compromise.