Flu vaccines are very safe. The commonest problem after vaccination is slight soreness of the arm at the point where the injection was given; and less often, slight temperature and aching muscles can occur for a couple of days, but this responds easily to remedies like paracetamol; or redness and irritation at the injection site, sometimes lasting 2 or 3 days – it responds to taking ibuprofen and applying a cold flannel. The risk of more serious reactions is extremely small – of the order of one in a million, or less; and considerably smaller than the risk of serious complications from the illness itself.
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