Rates of bowel cancer are rising among younger adults, with no clear reason why, experts are warning.
Although the disease still affects older people far more often, the increase in many countries among the under-50s is concerning, Cancer Research UK says.
England is one the countries with the biggest rise, averaging a 3.6% increase per year, researchers report in the journal Lancet Oncology.
Poor diet and obesity may be among the risk factors involved, the researchers say.
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