I am wondering why my 2 year old son is having frequent painful erections? This all started after he had a VCUG back in June, which put him in alot of pain for almost a week. He has throws fits & fights us to even change his diapers since then. It s like watching him relive that whole experience all over, again & again. At first he was having them occasionally, now it s almost everyday, sometimes several times a day. They show up unexpectedly, it even happens while just playing with his toys, or watching t.v., etc..he will jump up & run screaming for several minutes complaining his wee wee hurts. I have an older son in his 20 s & i do not remember him ever having any similar problems or complaints as a toddler or young boy, nor do any of my friends or family members with their own sons. I am totally clueless as to what could be wrong.