Prostate problems

I never in my wildest dreams thought prostrate cancer would affect your licence , but of all the things I’ve got that I assumed would cause me issues renewing my license this is the one that’s causing the issue., apparently doctor put it on medical form & now it’s got to go through my urology consultant to confirm what I’m saying on the second set of forms I’ve filled in (civ & d497) are true
As if we’ve not got enough with living with cancer , I’d love to know why having prostrate cancer would mean you’d need special controls to drive car or lorry !! Apparently the dvla think it does