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Flu jab side effects: common questions

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Before receiving the flu vaccination, there are a few flu jab side effects to note. After the jab, you may feel a mild fever and slight muscle aches for a day or so, however this is completely normal and is nothing to worry about. Others may also have a sore arm after getting your vaccination.

Here, at LloydsPharmacy, we answer all your common questions on the side effects of the flu jab, plus watch our video to find out more about flu. 


Can you have an allergic reaction from the flu jab (vaccine)?

It is rare, but allergic reactions can occur. Signs to look out for are hives, swelling, heart racing and difficulty breathing.

Does the flu jab make you ill?

It is a common misconception that the flu jab gives you the flu, but minor reactions of flu-like symptoms including mild fever and tiredness are reported by some patients.

Does the flu jab make your arm sore?

A sore arm after any vaccination is common, and the pain comes from the muscle where the injection was given. A sore arm is a good sign as your body is responding to the vaccine.

Can the flu vaccine make you tired?

Most people feel fine after a flu jab, but some people do report feeling tired a day or two after receiving the vaccination.

Is fatigue one of the side effects of the flu jab?

When you get vaccinated the antibodies in your system are fighting the bacteria in the vaccine to make you immune, and feeling mild fatigue and tiredness is completely normal.

Can the flu jab give you a headache?

Although most people feel fine after a flu shot, some flu-like symptoms like a headache can occur.

Will the flu jab give me a cold?

No, the flu shot does have mild side effects for some people but it does not make you sick.

Can I get the flu jab if I am sick?

Talk to your doctor about your symptoms, you can still get the flu vaccination if you have a mild illness, but you might need to reschedule if your doctor advises you to recover.

How long does it take before I am protected with the flu vaccine?

Two weeks after having the flu vaccine you will be immunised from flu.

Flu jabs are available at LloydsPharmacy

Although you don’t need to book an appointment, we advise that you ring ahead at your local LloydsPharmacy to check availability or if you'd like you can book online. Our pharmacists in store will be happy to help find a day and time to suit you. Or if you'd prefer you can complete your flu vaccination prescription order online ahead of your visit with our Online Doctor.

Book your flu jab