Hey Son
Besides being a full time medic, I am a 2nd Dan black belt in Tae Kwon do and teach classes to all age groups 3-5 times a week. I will tell you that though I have no pain in performing martial arts a kick or punch directly to the port site does sting a little, Though there is no way to damage the band or the port you can and usually will have some tenderness at the port especially in sparring. That being said i have learned to block a lot better