That's very unusual.
We took J to the doctor this afternoon. I had my suspicions about what was wrong with him and when I called in, I told the nurse what I was thinking. It was clear from her responses that she thought I was crazy but when we saw the doctor later, he confirmed that I was right. To be fair to the nurse, this issue is much more common in people over 60, not in 12-year-olds.
Anyway, he's not sick sick. We got a prescription and hopefully in a week or two, it'll go away and he'll be just fine.