Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
To maximize protection from the Delta variant and prevent possibly spreading it to others, get vaccinated as soon as you can and wear a mask indoors in public if you are in an area of substantial or high transmission.
UPDATE
Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the guidance for fully vaccinated people. CDC recommends universal indoor masking for all teachers, staff, students, and visitors to K-12 schools, regardless of vaccination status. Children should return to full-time in-person learning in the fall with layered prevention strategies in place.
UPDATE
The White House announced that vaccines will be required for international travelers coming into the United States, with an effective date of November 8, 2021. For purposes of entry into the United States, vaccines accepted will include FDA approved or authorized and WHO Emergency Use Listing vaccines. More information is available here.
UPDATE
Travel requirements to enter the United States are changing, starting November 8, 2021. More information is available here.

Possible Side Effects After Getting a COVID-19 Vaccine

Possible Side Effects After Getting a COVID-19 Vaccine
CDC has expanded recommendations for booster shots to now include all adults ages 18 years and older who received a Pfizer-BioNTech or Moderna (mRNA) COVID-19 vaccine as part of their primary series. Get more information and read CDC’s media statement.

COVID-19 vaccination will help protect people from getting COVID-19. Adults and children may have some side effects from the vaccine, which are normal signs that their body is building protection. These side effects may affect their ability to do daily activities, but they should go away in a few days. Some people have no side effects, and allergic reactions are rare.

Serious side effects that could cause a long-term health problem are extremely unlikely following any vaccination, including COVID-19 vaccination. Vaccine monitoring has historically shown that side effects generally happen within six weeks of receiving a vaccine dose. For this reason, the U.S. Food and Drug Administration (FDA) collected data on each of the authorized COVID-19 vaccines for a minimum of two months (eight weeks) after the final dose. CDC is continuing to monitor the safety of COVID-19 vaccines even now that the vaccines are in use.

The benefits of COVID-19 vaccination outweigh the known and potential risks. Rare cases of myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the outer lining of the heart) in adolescents and young adults have been reported more often after getting the second dose than after the first dose of either the Pfizer-BioNTech or Moderna COVID-19 vaccines.

Get a COVID-19 vaccine for children ages 5 years and older as soon as you can.

Common Side Effects

On the arm where you got the shot:

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  • Pain
  • Redness
  • Swelling

Throughout the rest of your body:

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  • Tiredness
  • Headache
  • Muscle pain
  • Chills
  • Fever
  • Nausea

Anyone who has had a severe allergic reaction after getting a mRNA COVID-19 vaccine (Pfizer-BioNTech or Moderna), should not get another dose of either of the mRNA COVID-19 vaccines.  Anyone who has had a severe allergic reaction after receiving Johnson & Johnson’s Janssen (J&J/Janssen) COVID-19 vaccine, should not receive another dose of that vaccine.

Learn about getting a different type of COVID-19 vaccine after an allergic reaction.

Helpful Tips to Relieve Side Effects

Talk to a doctor about taking over-the-counter medicine, such as ibuprofen, acetaminophen, aspirin (only for people age 18 or older), or antihistamines for any pain and discomfort experienced after getting vaccinated.

People can take these medications to relieve side effects after vaccination if they have no other medical reasons that prevent them from taking these medications normally. Ask your child’s healthcare provider for advice on using a non-aspirin pain reliever and other steps you can take at home to comfort your child after vaccination.

It is not recommended to take these medicines before vaccination for the purpose of trying to prevent side effects.

To reduce pain and discomfort where the shot is given

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  • Apply a clean, cool, wet washcloth over the area.
  • Use or exercise your arm.

To reduce discomfort from fever

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  • Drink plenty of fluids.
  • Dress lightly.

After a Second Shot

Side effects after the second shot may be more intense than the ones experienced after the first shot. These side effects are normal signs that the body is building protection and should go away within a few days.

If You Received a Booster Shot

So far, reactions reported after getting a booster shot were similar to those after the two-dose or single-dose primary series. Fever, headache, fatigue and pain at the injection site were the most commonly reported side effects, and overall, most side effects were mild to moderate. However, as with the two-dose or single-dose primary series, serious side effects are rare, but may occur.

When to Call the Doctor

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Side effects can affect you or your child’s ability to do daily activities, but they should go away in a few days.

In most cases, discomfort from pain or fever is a normal sign that the body is building protection. Contact a doctor or healthcare provider:

  • If the redness or tenderness where the shot was given gets worse after 24 hours
  • If the side effects are worrying or do not seem to be going away after a few days

If you or your child get a COVID-19 vaccine and you think you or they might be having a severe allergic reaction after leaving the vaccination site, seek immediate medical care by calling 911. Learn more about COVID-19 vaccines and rare severe allergic reactions.

Remember

  • The Pfizer-BioNTech COVID-19 vaccine and Moderna COVID-19 vaccine both need 2 shots to complete the primary series. Adults and children ages 5 years and older should get the second shot even if they have side effects after the first shot, unless a vaccination provider or doctor says not to get it.
    • CDC recommends that moderately to severely immunocompromised people ages 12 years and older who completed their Pfizer-BioNTech COVID-19 vaccine primary series and ages 18 years or older who completed their Moderna COVID-19 vaccine primary series should plan to get an additional primary dose followed by a booster shot. This additional primary dose is intended to improve immunocompromised people’s response to their primary vaccine series
    • COVID-19 vaccine booster shots are recommended for some people ages 18 years and older who completed their primary vaccination series with the Pfizer-BioNTech or Moderna COVID-19 vaccines at least 6 months ago.
  • The J&J/Janssen COVID-19 vaccine needs a single shot to complete the primary series. Learn more about the different COVID-19 vaccines.
    • People ages 18 years and older should receive a booster shot at least 2 months after receiving their J&J/Janssen COVID-19 vaccine.
  • It takes time for the body to build protection after any vaccination. People are considered fully vaccinated 2 weeks after their second dose of the Pfizer-BioNTech or Moderna COVID-19 vaccine, or two weeks after the single-dose J&J/Janssen COVID-19 vaccine. You should keep using all the tools available to protect yourself or your child until fully vaccinated.
  • Millions of people have received COVID-19 vaccines, and no long-term side effects have been detected.
  • There is no evidence that COVID-19 vaccines cause fertility problems.
  • CDC continues to closely monitor the safety of COVID-19 vaccines. If scientists find a connection between a safety issue and a vaccine, FDA and the vaccine manufacturer will work toward an appropriate solution to address the specific safety concern (for example, a problem with a specific lot, a manufacturing issue or the vaccine itself).

If you or your child is fully vaccinated, you can participate in many of the activities that you did prior to the pandemic. Learn more about what you can do when you have been fully vaccinated.

If you would like to report an adverse event, side effect or reaction from the COVID-19 vaccine, please use the following link: https://vaers.hhs.gov/external icon

Enroll in v-safe

After vaccination, enroll yourself or your child in v-safe, a free, easy-to-use, and confidential smartphone-based tool that uses text messaging and web surveys to provide personalized health check-ins after COVID-19 vaccination. Through v-safe, you can report how you or your child is feeling after getting vaccinated. V-safe also reminds you to get your second dose. Learn more about v-safe.

fact sheet thumbnail - What to Expect after Getting a COVID-19 Vaccine

What to Expect after Getting a COVID-19 Vaccine

Fact sheet for healthcare workers to give after vaccination.

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