A woman has revealed how her breasts grew to an extraordinary size after she started taking weight-loss jabs, leaving her with the biggest boobs in Britain and a daily struggle with pain and discomfort.
Tianna Moon, 30, from East Anglia, claims her breasts began growing rapidly after she started taking the skinny jab Mounjaro. She quickly went from an L cup to an NN, and now wears a 32OO, overtaking previous record holders Melissa Ashcroft and Summer Roberts.
Rapid Growth and Daily Struggles
The model says her new bust, which developed over just a few months, makes even the simplest tasks an uphill battle. During the summer, her life becomes a misery as the heat exacerbates her discomfort.
"The hot weather has been far from pleasant," she said. "My boobs are like a heat factory and there isn't really much I can do to keep cool."
Stairs have become a major hazard. "I'm forever tripping up on them. I have to go really slow, as I can't see my feet anymore. It's ridiculous - but it's the truth," she admitted.
Sleep and Breathing Problems
Even sleep is now stressful. "Since losing weight, it's easier for me to move in my sleep, meaning I end up on my back more. But I keep waking up frequently, as the added weight on my chest suffocates me," she revealed.
Tianna suffers from gigantomastia, a rare condition causing rapid and excessive growth of breast tissue. While she initially hoped to find a silver lining in claiming the title of Britain's biggest boobs, she now wants it to stop, saying all she wants is comfort.
Pain and Desire for Reduction
"I'm not the biggest in the world, nor do I want to be. I'm in so much pain now," she said. A breast reduction is not a straightforward solution. "The glandular tissue could continue to grow after a reduction and then I'd have scar tissue to factor in, too. I have thinning on the sides of my breasts, so that skin with a reduction would have a higher chance of ripping open."
She added, "Nobody knows why I have this condition and so it'd be hard to find a surgeon that would be happy to operate."
Weight Loss Journey and Coping
Tianna underwent gastric sleeve surgery in November 2025 to lose weight, but her breasts only increased. She has since taken matters into her own hands with exercise, which is helping in other ways.
"I do weight training and resistance band training. It's helping me to strengthen my spine and keep a better posture," she said. However, she still faces challenges. "I forget how big my boobs are, though, as I live with them. I'm forever knocking stuff over and walking into things since I can't see."
Long car journeys are also painful. "Sitting in a car for over an hour does cause a lot of tension and pain in my upper back. This is something that's only started in the last few months; so I've remained at home pretty much," she concluded.
