KEY POINTS
  • Big medical bills are what most often force Americans to the financial brink, according to a recent study.
  • That is driven by factors including the high cost of care or money lost due to time out of work.
  • One big reason for Americans' plight: insufficient insurance coverage. Typical policies only offer "very partial protection," a co-author of the research says.

Americans collectively hold a record $1.6 trillion in student loan debt. But that's not the No. 1 reason that prompts them to file for bankruptcy.

Here's what most often does drive them to the financial brink: big medical bills.