Amateur boxers wear headgear, which does help somewhat.
But what you're saying makes sense since boxing is all about hitting someone else in the head repeatedly. (for the most part, anyway. body shots are useful too, when you can get some in).
I was more curious about the pros, where anything goes.
Absorbing head shots with the back of your head bouncing off of the ring surface has to take a toll in some way.
Insert profound martial arts quotes or tough guy phrases here.