How do I report an unexpected side effect?

It is important to report any unexpected side effects to the health care provider that gave you the vaccine so that they can be investigated further, even if you don't know if the vaccine caused them. By reporting an adverse event (a serious or unexpected reaction that happens after someone receives a vaccine), possible vaccine safety concerns can be investigated and appropriate actions taken. If you don't know who gave you your vaccine, contact your local health unit and ask to speak to a public health nurse.