A lot of it is technique, too. Sure at first you take punches squarely across your nose. Your nose breaks, and you learn to better angle your face so punches slide off. The first time you get nailed in the ribs you probably weren�t breathing right. It hurts and later bruises. Later you learn to exhale while being hit. Your techniques, stances, and posture change as you get more comfortable fighting; as does your understanding of your art. So how do you deal with pain? You adapt.
Is there mental/physical training to withstand pain?
An interesting study found that pain tolerance is also cultural. Certain cultures have developed higher pain tolerances than others. I discover a very interesting site
www.winyourmmafight.com. It gives a Blueprint That Reveals The 3 Keys To Successful Training, Diet And Preparation For Victory In An MMA Fight!