What are the common side effects after receiving a flu vaccine?
What are the common side effects after receiving a flu vaccine?
user
I think the common side effects are: slight headache, muscle ache, tiredness, and redness at the injection site.  For children, the common side effects are sleepiness and fever.
assistant
Do most people get side effects?
user
Yes, most people do.
assistant
How long will the side effects last? Just a day or two at most?
user