I received a tetanus shot a week ago, and my arm is very sore. Is this normal?

Yes, this is normal, as pain at the injection site (where the needle goes into your arm) is one of the most common side effects of receiving the tetanus vaccine. These symptoms usually go away in a few days. 

Other common reactions to the Tetanus and Diphtheria (Td) vaccine include:

• Redness and swelling at the injection site.
• Fever, headache and muscle soreness may also occur.

After a vaccine, pain and swelling can be managed with cold compresses at the injection site and acetaminophen, if needed. Avoid pressure on the injection site. Too frequent boosters of tetanus-containing vaccines may cause increased pain, swelling and redness at the injection site.

Report serious or unexpected reactions to a health care provider who gave the vaccine. For example:

• Pain, redness, or swelling went past the nearest joint (shoulder or elbow).
• Pain, redness or swelling that lasts for ten days or more.