While the content creator from the UK thought it was ‘odd’ that her breasts were growing while her weight was shrinking, it wasn’t until she looked at online health forums and researched using ChatGPT that she realized something was wrong.
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Now diagnosed with gigantomastia, a rare condition that causes a rapid and extreme growth in breast tissue, Moon has seen her chest size increase further and now struggles to find any bras that can support her.
But Moon, who suffers serious back pain and sores as a result of her condition, says she has found ways to ‘make it work’, buying the biggest size of bra possible and squeezing into it.
However, this has caused painful cuts and tears under her breasts, which grew to 34NN as she lost a further two stone. She explained: “Bras are impossible. Bras in my size NN don’t exist.
“I decided to lose weight and eventually started on Mounjaro and lost three stone over the course of a year. In that time my breasts grew from an L cup to an M cup. »
She has since ‘stepped away’ from bras entirely as a result of the pain they cause, deciding that she is ‘happier without them’. But more than half a year after her July 2025 diagnosis, she is still struggling with her expanded bust.
“The side effects are like having numb arms quite a lot and having quite severe indentations on my shoulders, » Moon shared. « I have some light scarring under my breasts where bras have rubbed and ripped the skin open.
“Also laying on my back is not something I can do for a long period of time as it restricts the amount of air flow I can get in”.
