Are there any serious health consequences to holding in a poo? I was at my house and I need to do a poo but my bathroom was being taken up by my siblings. I had to wait at least an hour b4 they came out and by then, I couldn't go - I don't feel the urge. 

I'm really annoyed and anxious, is there any serious health consequences? Should I try and force it out or wait until I feel the urge again?