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11 cancers on the rise in young people - scientists find first clue why it's happening

Researchers said obesity explains only part of the rise, with most increases in 11 cancers still unexplained and other causes under study.

  • A new study from the Institute of Cancer Research and Imperial College London identified 11 types of cancer rising in adults aged 20 to 49, based on national cancer registry data from 2001 to 2019.
  • Rising obesity rates since 1995 contribute to the trend, yet researchers found they cannot fully explain the escalation. Smoking, alcohol consumption, and other established risk factors remained stable or declined over the period.
  • Bowel and ovarian cancers are rising exclusively in the younger cohort, unlike nine other cancers also increasing in older adults. Experts estimate that for every 100 extra bowel cancer cases, only 20 are linked to excess weight.
  • Bradley Coombes, from Portsmouth, died at 23 after 18 months of symptoms went undiagnosed. His mother Caroline Mousdale said doctors dismissed his "red flag" symptoms because he was considered too young for bowel cancer.
  • Professor Montserrat Garcia-Closas from the ICR urged that "we cannot wait to act," calling for stronger public health policies on obesity. Researchers continue investigating other potential drivers, including ultra-processed foods and antibiotic use disrupting gut microbiomes.
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Medical Xpress broke the news on Tuesday, April 28, 2026.
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