19-Year-Old’s Breasts Balloon from B Cup to Triple G After Pfizer COVID-19 Vaccine — Researchers Call It First-of-its-Kind Case

Researchers from the University of Toronto have documented a rare instance of gigantomastia—abnormal and excessive breast growth—following the administration of the Pfizer COVID-19 vaccine.

A 19-year-old woman, previously healthy with no notable medical history, experienced rapid breast enlargement just one week after receiving her first dose of the Pfizer COVID-19 vaccine in September 2022.

Her condition worsened following the second dose, with her...