October 21, 2020
Common flu shot side effects that are totally normal

Common flu shot side effects that are totally normal


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The flu shot can cause some side effects which are usually normal.


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Face masks, hand washing, social distancing and avoiding gatherings are all essential for fighting and ending the COVID-19 pandemic. This year health authorities are asking everyone to get a flu shot to avoid a “twindemic” and the potential stress it could add to an already taxed health care system. 

According to the CDC, flu shots are safe and one of the best ways to prevent getting and spreading the flu to others. And for people that get vaccinated and get sick anyways, they often experience less severe symptoms

No matter how you look at it — flu vaccines can save lives. There are plenty of myths out there about the flu vaccine — one is that it can give you the flu. While that’s not true, you can experience some side effects from the flu shot. The side effects are usually mild and nothing to worry about, but it’s important to know about them so you’re not worried when you get your vaccine.

Below, Dr. Carmen Teague, specialty medical director at Atrium Health‘s Mecklenburg Medical Group shares what you need to know about common flu shot side effects that are normal, and which side effects may be a sign of something more serious. 

Common flu shot side effects 

The flu vaccine won’t give you the flu, but you can experience mild symptoms because of how the vaccine works. 

“The flu vaccine is designed to stimulate your immune system to build antibodies to the virus. That stimulation can cause a low-grade fever, a decrease in appetite, loose stool, mild fatigue or myalgia (muscle ache) and even a scant cough,” Dr. Teague says.

According to Dr. Teague, these symptoms usually resolve after a few days and are no cause for alarm. You may also experience some redness, swelling, or soreness where the shot was injected, which is also normal. 

The CDC says you can experience “flu-like” symptoms after getting the vaccine, such as:

  • Soreness, redness, and/or swelling at the injection site
  • Headache
  • Fever
  • Nausea
  • Muscle aches

The symptoms listed above should resolve in a few days. Also, keep in mind not everyone has symptoms, but those are the most common. When it comes to other symptoms, or symptoms that last longer, it’s important to keep in mind that you can still catch a cold, or other virus, right after you get the flu shot. 

So if you experience other symptoms that seem like the flu, it could be another illness and it does not mean the shot made you sick. The flu shot also takes about two weeks to become effective at protecting you from the flu, so you could technically catch the flu within that two-week window.

Signs of a more serious (but rare) reaction

“A very small percentage of people can have a true allergic reaction to the vaccine including chest tightness, difficulty breathing, wheezing, facial or throat swelling and redness of the eyes,” says Dr. Teague. If you experience these symptoms, you should seek medical attention immediately. Dr. Teague says severe allergic reactions usually happen within a few hours of getting the flu shot.

Signs of a severe allergic reaction, according to the CDC can include:

  • Difficulty breathing
  • Hoarseness or wheezing
  • Swelling around the eyes or lips
  • Hives
  • Paleness
  • Weakness
  • A fast heartbeat or dizziness

Another possible reaction is an infection where the shot was administered. “Patients can also develop an infection at the injection site which is manifested as worsening redness, swelling, warmth and tenderness,” Dr. Teague says. You should also seek immediate medical attention for this type of reaction. 

The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. Always consult a physician or other qualified health provider regarding any questions you may have about a medical condition or health objectives.



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