Headlines like “Warning: People vaccinated against COVID-19 could…” often leave out important context and can make ordinary health information sound alarming. The effects of COVID-19 vaccination vary by person, but large studies have shown that COVID-19 vaccines are generally safe and continue to provide protection against severe illness, hospitalization, and death.
Possible effects after vaccination include:
Common short-term effects
- Soreness, redness, or swelling where the shot was given
- Fatigue
- Headache
- Muscle aches
- Chills
- Fever
- Swollen lymph nodes
These usually improve within a few days.
Rare but recognized side effects
Some uncommon reactions have been identified, such as:
- Severe allergic reactions (anaphylaxis) — usually occurring shortly after vaccination and treatable with prompt care.
- Myocarditis or pericarditis (inflammation of the heart muscle or surrounding tissue) — seen rarely, more often in adolescent and young adult males after certain mRNA vaccines; most affected people recover with medical care.
- Rare clotting problems associated with some specific vaccine types (such a
