As the body works to build immunity, it is common to have temporary side effects after receiving many vaccines, including the COVID-19 vaccine. After any second dose, regardless of the vaccine (AstraZeneca, Moderna, or Pfizer), you may feel more, the same, or fewer side effects than after your first dose.
In clinical trials, mild to moderate side effects (such as fever, chills, tiredness and headache) were more common after receiving the second dose of an mRNA vaccine.
If you have a side effect after receiving the vaccine, contact your health care provider who will report the side effect directly to public health. Public health will keep track of the reported side effects to make sure the vaccine continues to be safe.