Complication due to flu shot is very rare and the effects can include ;
Local reaction at the site of injection such as soreness, pain and swelling. These are usually mild and should last less than 2-3 days.
Systemic reactions include fever, rash, malaise and muscle aches.
Allergic reactions include hives, angioedema and anaphylactic shock.
I would suggest that you see a family physician or an internist if you have any side effects from the flu shot.
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