Nearly six in 10 Americans say they have suffered financial hardship due to healthcare costs, a new study finds.

Researchers from the American Cancer Society looked at three different types of problems: difficulty paying medical bills, worrying about bills, and delaying or doing without care.

"With increasing prevalence of multiple chronic conditions, higher patient cost-sharing, and higher costs of healthcare, the risk of hardship will likely increase in the future," wrote researchers led by senior scientific director Robin Yabroff.

In the study, they analyzed data from the 2015-2017 National Health Interview Survey by the U.S. Centers for Disease Control and Prevention, and found that 56% of adults (more than 137 million) reported at least one of the three types of medical financial hardship.

Compared with those 65 and older, adults aged 18 to 64 were more likely to say they had difficulty paying medical bills (29% vs. 15%), worried about paying bills (47% vs. 28%), and delayed or went without care (21% vs. 13%).

Among adults aged 18 to 64, those with more health problems and lower levels of education were more likely to have greater levels of hardship.

Multiple types of hardship were more likely to be reported by women than men, and by uninsured people (53%) than those with some public (26.5%) and private insurance (23%).

The study was published online May 2 in the Journal of General Internal Medicine.

Unless steps are taken to address the problem, it's likely to get worse, the researchers noted in a cancer society news release.

The group said that high out-of-pocket spending for medical care is an increasingly pressing issue among U.S. patients because they might have to go into debt, face the potential loss of assets, and have to cope with distress and worry.