Holly, 27, is one of a growing number of young people getting the disease.
Her bloating and weight loss were originally put down to irritable bowel syndrome until she became so ill she ended up in A&E.
The young actress was diagnosed with advanced bowel cancer and needed aggressive treatment when she was just 23.
Holly said the intense chemotherapy “affected me in ways that I never thought it would” and the “hardest thing was just accepting that… life won’t be the same”.
She now lives with a stoma and needs regular monitoring.
Holly has been cancer-free for more than three years and is planning her wedding, but says there are days that being diagnosed so young leaves her “screaming and crying”.
“It all feels really unfair and I think, oh why me?”
Science doesn’t have a clear answer either. Everything from obesity and ultra-processed foods, to antibiotics and the microbiome to air pollution and microplastics have been suggested.