The other concern would be diabetes. But, you should also see that he's drinking more, more irritable, wetting the bed... there are some pretty obvious signs of diabetes. It's worth learning about, but I think you would have more concerns by now if it was diabetes.
Liz Lovin' DH DS (12) and forever missing DD (12/02/07)
From the withered tree, a flower blooms~ He's here!!! So crazy in love with my boy!!! 12/14/11
Holly and David
Adaline (3/20/10), and Charlie (1/26/12- 4/10/12) and our identical twins Callie and Wendy (01/04/13)
That said, it is VERY common for young boys to do this. It can be anxiety or for no apparent reason. My 5 yr old son has done this twice in the past year, both times lasted about a week and then faded back to normal. I got him tested both times. No problems.
You could probably wait it out for a few days, but if you see fever, pain, extreme thirst, or if he just seems "off" in any way, get him seen pronto.
Undiagnosed diabetes in a small child can get VERY serious VERY fast.
Take him in and get him checked tomorrow.
It may be absolutely nothing. But you are better safe than sorry.
Blessed partner to a great guy, and mama to 4 amazing kids. Unfortunate target of an irrationally angry IRL stalker.
Holding on to anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned. ~ Buddha