Dozens of British women have reported that their breasts increased in size after receiving the Covid vaccine, MailOnline can reveal.
The revelation comes days after shocking footage showed a 19-year-old Canadian woman’s breasts quadrupled in size in what experts believe is a rare reaction to Pfizer’s Covid jab dubbed the ‘Pfizer boob job’. “.
Now, MailOnline has uncovered data from Britain’s drug safety watchdog showing 33 reports of similar cases of “breast enlargement” after the Pfizer vaccine.
Another 11 British women reported an increase in breast size after the AstraZeneca vaccine, while four reported the same strange reaction after a Moderna vaccine.
These reports, made to the UK Medicines and Healthcare products Regulatory Agency (MHRA) Yellow Card system, are based solely on patient testimony.
They have not been verified by medical professionals, and experts note that these unexpected body changes may have occurred by chance and had nothing to do with the injection.
However, doctors have argued that the link between the unusual reaction and the vaccine is actually plausible.
Stating their case in a recent medical report about a young woman who suffered the complication, they theorize that a strange immune system reaction to the vaccine may have caused excessive growth of breast cells.
The report, prepared by doctors at the University of Toronto, spoke of a Canadian woman who went from a B cup to a triple G cup in six months after two doses of a Pfizer Covid injection.
The unnamed 19-year-old received her first dose of the Pfizer Covid vaccine in September 2022 and then noticed that her breasts had started to tingle and grow slightly.
Dozens of British women have reported their breasts increased in size after receiving the Covid vaccine, MailOnline can reveal
Both reactions accelerated after their second dose just three weeks later.
Over a total period of six months, her breasts grew to the size of a triple G cup. The average British woman’s bra size is 36DD.
Rapid breast growth is a rare condition known medically as gigantomastia.
Experts are still exploring what triggers it, although some cases are known to be the result of a hormonal problem or a reaction to certain medications.
Doctors who reported the case in the magazine. Plastic and Reconstructive Surgery—Global Opensuggested that the vaccine could have triggered a cause of gigantomastia called pseudoangiomatous stromal hyperplasia (PASH).
PASH itself is a little-known condition in which breast tissue cells called myofibroblasts overgrow, forming benign lumps.
It’s rare, as it’s only been medically documented about 200 times and no previous example had any known link to vaccines.


The anonymous woman is shown above after receiving breast reduction surgery. You are considering further procedures to return to your normal cup size.
But exactly how the vaccine would have triggered PASH is unknown.
The woman in the report had no underlying illness, and although her breasts appeared swollen and sagging, there were no masses.
An ultrasound and CT scan showed slightly swollen lymph nodes around the woman’s armpits and dense blood vessels, which doctors believe is due to enlarged breast tissue.
Analysis of tissue samples taken from biopsies confirmed that the growth was a result of PASH.
Despite treatment with steroids and antibiotics, no reduction in breast size was observed.
She decided to undergo a breast reduction procedure to reduce her bust size to a DD 11 months after the injection.
The patient underwent another procedure five months later for asymmetry problems, reducing her to her original B cup size.
While experts said the timing suggested a link between the Covid vaccine and PASH, they said it cannot be proven it was the culprit and called for further investigations.
“The association between the COVID-19 vaccine, PASH, and breast hypertrophy warrants further investigation to understand the spectrum of vaccine reactions,” they said.

The graph shows the cumulative number of Covid jabs administered in the UK in November 2023.
However, they criticized doctors who dismissed the woman’s concerns that her symptoms were related to the vaccine.
“Although a temporal relationship does not establish causation, ignoring patients’ concerns can erode trust,” they wrote.
“Physicians must consider and value patients’ concerns when developing therapeutic relationships.”
In 2021, researchers from the University of Pennsylvania found that Covid vaccines could cause swollen lymph nodes in the armpit, leading to abnormal findings on mammograms and breast ultrasounds.
British health officials were also aware of this link and issued a notice to staff that, while this can occur, any abnormal findings from these scans should be investigated as potential symptoms of breast cancer and not ruled out as a reaction to the vaccine. .
Systems such as the MHRA Yellow Card reporting, in theory, allow experts to track potential side effects through active monitoring, although some MPs are concerned the system is not proactive enough.
Such reports can serve as a “canary in the coal mine” if patterns emerge with a particular medication, type of patient, and suspected reaction.