It's interesting that some posters equate falling over with being hurt or humiliated - there's nothing humiliating in falling over, nor do most falls result in injury, for the young / moderately young and the fit at least. Most trips and falls don't actually result in either pain or humiliation.
Well nothing automatically causes humiliation - but I would expect there is a correlation for some people between falls and feeling humiliated because people laugh at them when they trip or stumble.
While there isn’t anything inherently humiliating in falling or tripping there is something humiliating for many people in being laughed at - and the strong association between tripping and people laughing at it then creates a link between humiliation and falling.
That must particularly be the case for those who don’t find other people tripping or stumbling remotely amusing - so being laughed at when it happens carries different weight and meaning.
For example, I was a very clumsy kid, due to some motor delays. I was very aware of and embarrassed by my shortcomings. People did laugh when I fell, often. And I did feel humiliated - it was a reminder of how embarrassed and frustrated and ashamed I felt about my shortcomings, and other people’s mirth at something I already felt shame over added to the humiliation.
Now these days I’ve learned resilience, I’ve learned to laugh at myself first even if I don’t find it funny to deflect the laughter of others, and I’m not as clumsy as I once was. But I take as my maxim that if the subject of the joke isn’t laughing, it’s probably not particularly funny.