I have had to get one every year the last decade or so and recall only once where my arm throbbed enough to keep me awake. I was thinking about this post last night Liz and so went reading at the CDC site this morning. I found a statement that says 15-20% of people receiving the shot (killed vaccine) will have some degree of localized symptoms at the injection site. That made me feel less nervous since I am getting my vaccine on Thursday.