The degree of pain from a tetanus shot depends on the method used. If it refers to the tetanus antitoxin, it requires a skin test, which typically involves some pain due to the skin being pierced. However, if the injection is administered into the muscle, the pain is generally less severe because it is given into a thick layer of muscle, making the pain less noticeable. The level of pain also varies from person to person, as everyone has different pain thresholds. Therefore, the degree of pain can differ significantly, so it should be judged according to an individual's constitution and personal sensitivity to pain. If one experiences pain from a tetanus shot, it might reach about a level 7 on the pain scale.