Could tdap( diphtheria, tetanus, and acellular pertussis) shots cause pain for over a week?

It can cause pain: Injections can cause local hematomas, or "bruises" to the muscle. This happens especially if a person or child tenses the muscle during an injection. After an injection, it is best to use cool compresses to the area for the first 24 hours - then change to warm compresses (not too hot!). Also, gentle massage to the area helps resolve the swelling.