When in doubt see a doctor and get an xray. I detached a ligament in my thumb during training in January and practised with it that way for almost 6 weeks before I finally got it looked at. I thought it was just a jammed thumb and was waiting for the discomfort to go away, it never did. I could have made it worse by training with it in that condition. Luckily I didn't but shouldn't have taken the chance, it could have had me out a great deal longer than the 5 weeks it has cost me so far due to surgury.