COVID-19 vaccine considerations
The COVID-19 vaccines have been shown in some cases to cause lymph nodes in the armpit to swell, especially on the side where the shot was administered. This swelling can make the nodes visible on a mammogram and could be mistaken as a lump.
Because of this, patients should consider avoiding routine screening mammograms within four to six weeks of vaccination. This is only for routine screening mammograms. You should not delay a mammogram that is needed because of a new breast symptom or abnormal check.
If you have recently been vaccinated, please let your care team know the date of your vaccination and the side you received your injection.