Why is my hamster urinating blood?

He’s a male Syrian about a year old he’s never had any health problems before. I’m selling my house currently and a some children visited the house today and I’m worried they may have squeezed him during the showing. Because there was no blood in his cage earlier in the day when I cleaned it, but there was some... show more He’s a male Syrian about a year old he’s never had any health problems before. I’m selling my house currently and a some children visited the house today and I’m worried they may have squeezed him during the showing. Because there was no blood in his cage earlier in the day when I cleaned it, but there was some this evening when I returned home. He’s behaving normally didn’t seem to be in pain when I handled him and seems to have good energy. Should I be worried?
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