My wife had tetanus shot 8 days ago but pain and stiffness in the muscle remains unchanged. what is going to happen and what shall we do? (f,33)

Local Reaction: Typical reaction to vaccines involve a local reaction. Manifests as redness and painful swelling around the site of the injection that in some cases may last for a few days. Uncomplicated local reactions may be treated with cold compresses and NSAIDs for pain. Could also be a local muscle contusion that takes time to heal. See primary doctor if pain persists despite above treatment.