P.S. If it helps, when we were in high school, we started calling it "manhunt" instead of hide-and-seek - it has more street cred ;)
I'm not sure why that would be, but I would say that's something to see a doctor about. It doesn't sound like a good thing.
And, yeah, hide and seek, cool. Jumping from buildings, not so much. One of my best friends used to do stuff like that, and by his mid-20's he had the back of a 40-year-old. It's not awesome to constantly throw your back out at 30. I know no one thinks about those things when they're 21, but...
you might have respiratory problems...go to the doctor and ask....brittany
My recommendation would be not to jump from 1 story buildings.. It isn't really safe at all.
And the cause for the blood might really differ, from simple gum bleeding or smth connected to the oral cavity. To various conditions of GI tract and Respiratory tract.
I would recommend you visiting a doctor if you are worried about it.
Please be careful
Regards, John.