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  2. Dec 11, 2021 · Key Takeaways. Most people have a sore arm right after being vaccinated, and more body-wide effects like fever and chills within 8 to 12 hours. Most side effects stop within 48 hours. The vaccine cannot cause a COVID-19 infection, so symptoms mean your body is building a healthy immune response.

  3. May 1, 2024 · Some people have no side effects from the COVID-19 vaccine. For those who get them, most side effects go away in a few days. A COVID-19 vaccine can cause mild side effects after the first or second dose. Pain and swelling where people got the shot is a common side effect. That area also may look reddish on white skin. Other side effects include:

    • Overview
    • How long do side effects last?
    • Common side effects
    • Differences in first and second-dose side effects
    • Moderna vs. other vaccines
    • When to contact a doctor
    • Summary

    The Moderna vaccine can cause mild side effects such as fatigue, muscle aches, and headache. Typically, these mild side effects may persist for up to 3 days.

    The Moderna vaccine is one of the most common vaccines that protect against SARS-CoV-2, the virus that causes COVID-19.

    Healthcare professionals have administered over 243 million doses of the original Moderna vaccine since the start of the COVID-19 pandemic. Adults should receive two doses of the vaccine 8 weeks apart, along with appropriate booster shots.

    Following the initial two doses and a first booster dose, the vaccine is highly effective at preventing severe COVID-19, hospitalization, and death. It also offers modest protection against symptomatic illness.

    Although the Moderna vaccine is highly effective, like all vaccines, it can cause side effects. Typically, these side effects are mild and go away on their own within a few days.

    Read on to learn more about the side effects relating to the Moderna vaccine, how long they last, and when someone should contact a doctor.

    Most people who receive the Moderna vaccine experience mild, local side effects at the injection site. Local effects typically appear within a couple of days following vaccination and persist for around 3 days.

    Systemic reactions, such as headaches, fever, and fatigue, often begin within the first 2 days of vaccination and last for 2–3 days. Overall, the side effects are generally mild and do not last long. Most people will not experience side effects after a few days.

    Pain, discoloration, and swelling at the injection site are the most common side effects relating to the Moderna vaccine. These are local reactions.

    Additionally, people can experience systemic side effects such as:

    •fatigue

    •headache

    •muscle pain

    •joint pain

    People may report more frequent or severe side effects after the second dose of the Moderna vaccine compared with the first. This is likely because the second dose elicits a stronger immune response.

    The Moderna vaccine is an mRNA vaccine that uses pieces of the virus’s genetic code to teach a person’s body to build immunity to the virus. Because the first dose primes the body to recognize the virus, reactions are typically mild. The second dose causes an exaggerated response.

    There have been some reports of myocarditis and pericarditis following vaccination with Moderna and other mRNA vaccines. This is typically within 1 week of the second dose and is more common among young males. Although potentially serious, most people respond well to medication and rest and recover quickly.

    Research also suggests that people who have had COVID-19 previously also have more severe reactions to the vaccine. This may be because their body is already primed to react to the vaccination as they have some level of preexisting immunity.

    Side effects of the Moderna vaccine are similar to those of the Pfizer vaccine, another mRNA vaccine.

    After getting the first dose of an mRNA vaccine, people commonly report injection site reactions such as pain, redness, and swelling after the first dose. They may report fatigue and joint pain after the second.

    Individuals receiving any of the COVID-19 vaccines can expect to experience mild to moderate side effects, but these vary by age group. The Centers for Disease Control and Prevention (CDC) notes that for those aged 4–17, side effects are more common after the second dose.

    Learn more about vaccine side effects in our dedicated COVID-19 hub.

    Most people who experience side effects from the Moderna vaccine recover within a few days without needing medical attention. However, in rare cases, reactions can be more severe.

    A person should contact a doctor if any of the following occur:

    •discoloration or swelling that continues to worsen at the injection site

    •hives

    •difficulty breathing or swallowing

    •swelling of the tongue or throat

    Following the Moderna shot, many people experience local reactions such as pain, redness, and swelling. Other common side effects include fatigue, headache, and muscle aches. These reactions are usually a sign that the body is building immunity.

    People may experience more severe reactions after the second dose, and reactions may also be more intense in those who have previously had COVID-19.

  4. Many people have reported side effects—such as headache, fatigue, and soreness at the injection site—that are generally mild to moderate and go away within a few days. Are the Vaccines Safe? What You Need to Know. The benefits of COVID-19 vaccination continue to outweigh any potential risks. Severe reactions after COVID-19 vaccination are rare.

  5. Apr 26, 2021 · When do the side effects start and how long do they last? According to the CDC, side effects usually start within a day or two of getting the vaccine, but they should also go away "in a few days." Are side effects more likely after the first or second dose?

  6. Mar 21, 2022 · However, if a person were to experience serious side effects, they are most likely to occur in the first 6 weeks after vaccination. According to the CDC, researchers have identified four...

  7. May 5, 2023 · Side effects generally go away in a few days. Even if you don’t experience any side effects, your body is building protection against the virus that causes COVID-19. Adverse events (serious health problems) are rare but can cause long-term health problems. They usually happen within six weeks of getting a vaccine.

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  2. 65 And Older & Got A 2023-24 COVID-19 Shot? You May Be Eligible For An Additional Dose. Talk To Your Doctor Or Pharmacist & Stay Up To Date With CDC Recommendations.

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