COVID-19 vaccines, like all vaccines, may cause side effects, although not everyone experiences them and those who do experience them mostly report minor side effects. The most commonly reported side effects after receiving a COVID-19 vaccine are localized reactions including pain, redness or swelling at the injection site, tiredness, headache, muscle pain, joint pain, chills, and mild fever.
Ongoing studies on these COVID-19 vaccines indicate serious side effects found to date are extremely rare. People who have received the vaccine in these studies continue to be monitored for any longer-term side effects.
Clinic staff are prepared to manage a severe allergic reaction should it occur. When receiving your second dose of COVID-19 vaccine, be sure to tell the health care provider administering the second dose if you had any side effects after the first dose.
Vaccine Side Effects
Vaccine Side Effects - Rash
COVID-19 Vaccine Information Sheet V9.0 - English (gov.on.ca)