Nearly 10% of U.S. adults have had cancer at some point in their lives, the latest Gallup poll shows. That's the largest percentage Gallup has recorded in more over 18 years of data collection, but the reasons behind it are complicated.

When Gallup first posed the question for its national health and well-being index, only 7% of respondents said a doctor or nurse had ever told them they had cancer. That figure was based on two-year averages between 2008 and 2009, and the rate stayed roughly the same for a decade. MORE: Thanksgiving travel may be particularly stressful this year. Here are tips to cope with the uncertainties and frustrations

When Gallup crunched the 2018-2019 numbers, however, the percentage had shot up to 8.3%. It has steadily climbed in the ensuing years. Most recen

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