Are you sure it is the number one reason in Canada? The first source I could find that provide a percentage breakdown was from 2011 and had medical reasons as #4:

http://www.creditcards.ca/credit-card-news/top-ten-reasons-w...

1. Overextension of credit (22 per cent of all Canadian bankruptcies).

2. Seasonal employment (15 per cent).

3. Job loss (12.8 per cent).

4. Medical problems (11.3 per cent).

...