Funbrunette it's better to be safe then sorry. If you think somethings not right take him in to the E.R.
A few weeks back my daughter *4yrs. old* was having problems going to the bathroom. She said it hurt when she went poo. Anytime she went to the bathroom she screamed. We first were aware of it when she woke us up at 5 in the morning screaming one night. The next day it was still the same so we took her into cheo and waited for over 6 hours to see a doctor.
She had a U.T.I *urinary tract infection* The doctor gave her medication and she is scheduled for a sonogram of the kidneys. And another test called a VCUG (voiding cysto-urethrogram) to see if she has urinary reflux or vesicoureteral reflux.
This is a condition that causes urine to move backwards from the bladder up to the kidneys.
She's doing 100% better now
But she's scheduled for those tests at the end of the month so we'll soon find out whats going on if anything.
When it comes to your kids F.B don't worry about looking like an idiot in the E.R.
Many parents wait and wait until something serious happens, sometimes when its too late.
As I said above its better to be safe then sorry, for your own peace of mind if anything.