Should I Be Concerned if My Lymph Nodes Are Swollen After My Vaccine?

COVID-19 vaccinations can cause harmless enlarged lymph nodes, usually under the arm and on the side the shot was given. For those who have previously had cancer or who are due for a regular mammogram screening, this swelling can cause confusion and anxiety.

Julie A. O’Brien, M.D., F.A.C.S., Breast Surgeon at Lahey Hospital & Medical Center and Director of Lahey’s Comprehensive Breast Health Center, discusses this potential vaccine reaction.