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Women who received the Pfizer mRNA vaccine are reporting an unexpected side effect that may boost mammogram appointments in America.

The women claim the Pfizer injections increased their breast size and they have dubbed the side effect the "Pfizer boob job."

According to Australian Department of Health, increased breast size and inflamed lymph nodes are a less common side effect of the vaccinations.

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Doctors in the U.S. have reported an increase in newly vaccinated women making mammogram appointments due to swollen breasts.

Dr. Laura Esserman, director of University of California San Francisco’s Breast Care Center, said women were confusing swollen lymph nodes after the vaccine for signs of cancer.

Dr. Esserman said "hundreds of thousands of women" will be affected by the rare side effect.

"I'm sure hundreds of thousands of women will be affected by this for sure," Dr. Esserman told ABC7 Chicago.