[oh8eleven]

Usually my shoulder aches for a few days after the shot. This time it hardly ached at all.
Got a flu shot in boot camp (mid 60s) that caused my arm to really hurt for a full day. I put off getting a flu shot for ten years because of that memory.
However, since the mid 70s, I've never had one that hurt.

[George from New England]

Whether the shot hurts of not is really irrelevant.

Hurt is about where the liquid got deposited in the muscle. If the volume and location is near a nerve it will hurt more and longer. Case closed.