I had a tetanus shot the day b4 thanksgiving because i cut my thumb open and had 9 stitches. now i have pain in the arm and can't move it much..

Go back to doctor: I had same problem with a patient. The shot was given by a nurse from another clinic. The pain and inability to move was from hitting a nerve on the injection site and had nothing to do with infection or the cut nor the medicine given. Have it examined and work up can be done.

Pain in the hand, : Going up the arm, with swelling and redness is sign of an infection from a cut in the finger and treatament should be sought immediately. Pain in the area of the tetanus shot can be from a local reaction but can also mean that the area is irritated too much. In either case or if both pain that limits motion in the arm after a laceration in the thumb is not normal and you need follow up care now.