Pfizer Side Effects

Pfizer-BioNTech COVID-19 vaccines can cause a range of side effects, most of which are mild and temporary. The most commonly reported side effects include:

Injection site reactions (pain, redness, swelling)
Tiredness/fatigue
Headache
Muscle pain
Chills
Joint pain
Fever
Nausea
Feeling unwell
Swollen lymph nodes (lymphadenopathy)
Decreased appetite
Diarrhea
Vomiting
Arm pain

Other, less common side effects may include:

Dizziness
Irritability
Febrile seizures (convulsions during a fever, primarily in children)
Fainting, which may be associated with the injection^[2][3][4]

Rare but serious side effects have also been reported, such as:

Myocarditis and pericarditis (inflammation of the heart muscle or its lining). These can present as chest pain, shortness of breath, or a fast, fluttering, or pounding heart, and are most often reported in adolescent and young adult males within seven days after the second dose.^{[1][2][3][6][7]}
Severe allergic reactions (including anaphylaxis), characterized by symptoms such as rash, itching, swelling of the face/tongue/throat, severe dizziness, and trouble breathing.^[1][2][3]
Non-severe allergic reactions (e.g., rash, itching, hives, swelling of the face)^[2]

If you or your child develop any of the following symptoms soon after vaccination, medical attention should be sought right away: chest pain, shortness of breath or difficulty breathing, fast or irregular heartbeat, persistent vomiting, persistent abdominal pain, unusual pallor, or persistent irritability/fatigue in children.^[2]

Most side effects resolve on their own within a few days. However, monitoring continues, and healthcare providers can report adverse effects to national surveillance systems. The vast majority of people do not experience serious side effects, and the vaccine is recognized as having a favorable benefit-risk profile.^{[1][2][3][4][7]}

There is no credible evidence that the Pfizer-BioNTech COVID-19 vaccine causes diseases such as heart failure, liver damage, stroke, cancer, or monkeypox. Claims to that effect have been repeatedly debunked by medical authorities and fact-checkers.^[5][6]

References

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