Side effects of the flu shot and how to deal with them

This blog is for educational purposes only and does not replace professional medical advice or diagnosis. If you have health concerns, consult an AHPRA-registered telehealth doctor or request a medical certificate online if clinically appropriate. Please note: Hola Health does not currently offer Mental Health Care Plans.

---

Overview

Most side effects from the flu shot—like a sore arm, mild fever, or fatigue are temporary and easy to manage at home. Most symptoms resolve within a day or two. Still it’s good to know what’s normal, what’s not, and when you should see a doctor. Getting the flu shot is one of the most effective ways to protect yourself and your community during the flu season in Australia.

It reduces your chances of catching influenza and lowers the risk of transmitting it to others, especially elderly Australians, young children, and people with chronic conditions. Like all vaccines, it may trigger minor side effects. But, there is nothing to worry, they’re normal, short-lived, and simply indicate your immune system is strengthening its defences.

Side effects of the flu shot

It’s absolutely normal to feel slightly unwell for a day or two after getting your flu shot. Common side effects include:

• Soreness, redness, or swelling at the injection site
• Mild fever (generally low-grade and temporary)
• Headache and muscle aches
• Tiredness or fatigue

These side effects are a sign your body is responding to the vaccine. They normally disappear within a couple of days.

Managing and recovering

You can usually manage flu shot side effects at home with simple self-care:

Sore arm:

• Apply a cold compress to reduce swelling.
• Keep the arm moving gently to avoid stiffness
• Refrain from lifting heavy things for a day

Mild fever or body aches:

• Rest and stay hydrated
• Take paracetamol if required (always follow the label or check with a pharmacist)

Fatigue:

• Get adequate rest; your body is working hard to strengthen immunity.
• Avoid heavy exercise or late nights for a day or two.

Mild nausea:

• Eat light meals
• Sip water or electrolyte drinks to stay hydrated

How long do flu shot side effects last?

Most side effects resolve within 24 to 48 hours.

• Sore arms usually settle in 1-3 days.
• Fever, fatigue, or body aches ease within 1-2 days.

In most cases, you’ll be back to normal within a couple of days. However, if you develop a fever higher than 39°C, are in significant pain, or your symptoms don’t ease within two days, seek advice from your GP or a telehealth doctor.

What not to do after a flu shot?

For a smooth recovery after your vaccine, try to avoid the following:

• Intense training at the gym– give yourself a break from high-intensity workouts for a day.
• Avoid consuming alcohol– it can dehydrate you and make side effects worse.
• Don’t take medicines if you don’t require unless advised by your doctor.

When to see a doctor

While mild side effects are normal, it’s important to know when to seek medical help. See a GP if you experience:

• Side effects that last more than 48 hours
• A fever above 39°C

• Severe swelling or redness at the injection site
• Signs of an allergic reaction such as difficulty breathing or swelling of the face or throat.

Can a telehealth doctor help?

Yes, telehealth consultations are a convenient way to discuss flu shot concerns, side effects, and management strategies. If you’re unsure whether your side effects are normal or just want peace of mind, a telehealth doctor can:

• Check your symptoms online
• Provide advice or treatment, if required
• Issue a medical certificate if you’re unwell and need time off work
• Provide referrals if further evaluation is required

How can Hola health help

With Hola Health, you can:

• Speak to an online Doctors in Australia 24/7
• Get prescriptions or online doctor certificate
• Receive doctor’s referral online
• Access care from the comfort of home

Visit Hola Health to book an online appointment anytime.

Conclusion

Flu shot side effects are generally mild and short-lived, a clear sign your immune system is doing its job. A little discomfort is worth the stronger defence it provides in the flu season. If your symptoms don’t improve or you’re worried, Hola Health’s online doctors are here 24/7 to provide quick, professional advice.