Had one on Monday, no problems at all. Arm was barely sore.

I had a tetanus shot after an injury and weird allergic skin reactions that came out exactly 1 week later. My entire injection site upper arm turned red, swollen, and extremely itchy. Couldn't find out any information about that.

Anonymous wrote:I learned a trick... if you massage the area vigorously for 5 minutes or so, before and after, that will significantly decrease any residual soreness the following day(s).

This, plus flex the muscle. It all helps.

I had zero side effects. Nothing.

I don’t remember anything about it. Which means it was nothing. I got a booster within the past two years.

Got it last year and zero side effects. For any vaccine, make sure you’re moving that arm a lot in the hours after the shot (make big circles from the shoulder).