Dozens of British women have seen their breasts grow after the Covid jab – experts reveal why

Dozens of British women have reported their breasts ballooning in size after receiving a Covid vaccine, MailOnline can reveal.

The revelation comes days after shocking images showed how a 19-year-old Canadian woman’s breast 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 the British drug medical safety watchdog showing 33 reports of similar cases of ‘breast enlargement’ following Pfizer’s vaccine. 

A further 11 British women reported an expanded bust after AstraZeneca’s jab, while four reported the same bizarre reaction after a Moderna vaccine.

These reports, made to the UK’s Medicines and Healthcare products Regulatory Agency (MHRA) Yellow Card system, are based on patient testimony only. 

They have not been verified by medical professionals, and experts flag that it is possible such unexpected bodily changes occured by chance — and had nothing to do with the jab.

However, doctors have argued that the link between the unusual reaction and the vaccine is indeed plausible.

Making their case in a recent medical report about a young woman who suffered the complication, they theorize that a bizarre immune system reaction to the vaccine may have caused cells in the breast to overgrow.

The report, by medics at the University of Toronto, told of a Canadian woman who went from a B cup to triple G cup within six months of two doses of a Pfizer Covid jab.

The unnamed 19-year-old received her first dose of the Pfizer Covid vaccine in September 2022 and then noticed her breasts had started tingling and growing slightly.

Both reactions accelerated following her second dose just three weeks later.

Over a total six-month period, her breasts grew to a triple G cup size. The bra size of an average British women is 36DD. 

Rapid breast growth is a rare condition medically known as gigantomastia.

Experts are still exploring what triggers it though some cases are known to be the result of hormone problem or a reaction to certain drugs.

Doctors, who reported the case in the journal Plastic and Reconstructive Surgery—Global Open, suggested the vaccine may have triggered a cause of gigantomastia called pseudoangiomatous stromal hyperplasia (PASH). 

PASH itself a poorly understood condition where cells in the breast tissue called myofibroblasts overgrow as benign lumps.

It is rare, having only been medically documented some 200 times, and no previous examples had any known link to vaccines. 

But how exactly the vaccine would have triggered PASH is unknown. 

The woman in the report had no underlying conditions and while her breasts seemed swollen and saggy, there were no masses.

An ultrasound and CT scan showed slightly swollen lymph nodes around the woman’s armpits and dense blood vessels, which the medics believe was from the enlarged breast tissue.

Analysis of tissue samples taken from biopsies confirmed the growth was result of PASH. 

Despite a course of treatment involving steroids and antibiotics no reduction in breast size was noted.

She chose to undergo a breast reduction procedure to take her bust size down to a DD 11 months after the jab.

The patient underwent another procedure five months later due to problems with asymmetry, taking her down to her original B cup size. 

While the experts said the timing suggested a link between the Covid jab and PASH, they said it cannot be proven it was the culprit and called for further research.

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

However, they criticised medics who dismissed the woman’s concerns that her symptoms were linked to the vaccine. 

‘Although a temporal relationship does not establish causality, dismissing patient concerns can erode trust,’ they wrote.

‘Physicians should consider and value patient concerns when developing therapeutic relationships.’

In 2021, researchers at the University of Pennsylvania found Covid vaccines could lead to swollen lymph nodes in the armpit, leading to abnormal findings on mammograms and breast ultrasounds.   

British health officials were also aware of this link, issuing a notice to staff that while this may occur, any abnormal findings from these scans should still be investigated as potential breast cancer symptoms and not dismissed as a vaccine reaction. 

Systems like MHRA’s Yellow Card reports, in theory, allow experts to track potential side effects through active monitoring, though some MPs are concerned the system isn’t proactive enough. 

Such reports can serve as a ‘canary in the coal mine’ if patterns emerge with a particular drug, type of patient, and a suspected reaction.