Flu shot unwanted side effects 2021: What’s regular and what’s trigger for concern

Flu shot side effects 2021: What's normal and what's cause for concern

The flu shot could cause some unwanted side effects that are often regular.


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The coronavirus remains to be a really actual concern this fall, as is the influenza virus aka the flu. The excellent news is we’ve got very protected and efficient instruments for combating and stopping each doubtlessly lethal viruses, because of the COVID-19 vaccines and the flu vaccine. 

Based on the CDC, flu pictures are protected and among the best methods to maintain from getting and spreading the flu to others. And individuals who get vaccinated and get sick anyway typically expertise much less extreme signs. Should you’re pondering of getting vaccinated for each COVID-19 and the flu, the CDC says it’s protected to get each vaccines collectively (this consists of COVID-19 boosters).

The easy reality is, flu vaccines can save lives. There are many myths on the market concerning the flu vaccine, akin to the concept it may well provide the flu. Whereas that is not true, you may expertise some unwanted side effects from the flu shot. The unwanted side effects are often gentle and nothing to fret about, nevertheless it’s essential to find out about them so you are not frightened while you get your vaccine.

Under, Dr. Carmen Teague, specialty medical director at Atrium Well being‘s Mecklenburg Medical Group shares what you could find out about frequent flu shot unwanted side effects which are regular, and which unwanted side effects could also be an indication of one thing extra critical. 

Widespread flu shot unwanted side effects 

Repeat: The flu vaccine will not provide the flu, however you may expertise gentle signs due to how the vaccine works. 

“The flu vaccine is designed to stimulate your immune system to construct antibodies to the virus. That stimulation could cause a low-grade fever, a lower in urge for food, free stool, gentle fatigue or myalgia (muscle ache) and even a scant cough,” Teague says.

Based on Teague, these signs often resolve after a number of days and aren’t any trigger for alarm. You might also expertise some redness, swelling or soreness the place the shot was injected, which can be regular. 

The CDC says you may expertise “flulike” signs after getting the vaccine, akin to:

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

The signs listed above ought to resolve in a number of days. Additionally, take into accout not everybody has signs, however these are the most typical. Relating to different signs, or signs that last more, it is essential to remember that you may nonetheless catch a chilly, or different virus, proper after you get the flu shot. 

So when you expertise different signs that appear just like the flu, it may very well be one other sickness and it doesn’t suggest the shot made you sick. The flu shot additionally takes about two weeks to grow to be efficient at defending you from the flu, so you might technically catch the flu inside that two-week window.

Indicators of a extra critical (however uncommon) response

“A really small share of individuals can have a real allergic response to the vaccine, together with chest tightness, issue respiration, wheezing, facial or throat swelling and redness of the eyes,” Teague says. Should you expertise these signs, it’s best to search medical consideration instantly. Teague says extreme allergic reactions often occur inside a number of hours of getting the flu shot.

Indicators of a extreme allergic response, in accordance with the CDC, can embrace:

  • Problem respiration
  • Hoarseness or wheezing
  • Swelling across the eyes or lips
  • Hives
  • Paleness
  • Weak spot
  • A quick heartbeat or dizziness

One other potential response is an an infection the place the shot was administered. “Sufferers can even develop an an infection on the injection web site, which is manifested as worsening redness, swelling, heat and tenderness,” Teague says. You also needs to search rapid medical consideration for any such response. (Should you’re unsure if it is the frequent, innocent redness-and-swelling aspect impact or an an infection, verify with a physician.) 

The data contained on this article is for academic and informational functions solely and isn’t supposed as well being or medical recommendation. At all times seek the advice of a doctor or different certified well being supplier concerning any questions you will have a few medical situation or well being targets.

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