Case of a 19 year-old woman experiencing significant breast hypertrophy starting 1 week after receiving the Pfizer COVID-19 vaccine in September 2022.

"The patient initially reported tingling paresthesia in her breasts, followed by sudden bilateral growth which worsened after receiving the second vaccine dose. Over 6 months, her breast size increased from a B cup to a triple G."

"The association between the COVID-19 vaccine, PASH, and breast hypertrophy warrants further investigation to comprehend the spectrum of reactions to the vaccine."