I know that sometimes stressing the anus too much- whether from stretching it without enough preparation, to pushing too much with the anal muscles can cause small precursors to hemorrhoids. Not even big ones, just a little bump and such.

I am wondering if there are ways to prevent this other than "don't push when defecating- wait till you've REALLY gotta go", and "don't stick anything up there for a while".

How long is the average healing-time for a non-painful hemorrhoid that only shows when 'pushing'? Is it usually a problem that will heal but then start up again more easily because you've had it in the past?