What cause the red blood vessel contained by your eyes to come up?

What cause the red blood vessel contained by your eyes to come up?
Unfortunately, just going on for anything...so it is very thorny (impossible really) to make a diagnosis base on red eyes. Here are a few things that can cause red eyes: bacterial, viral, allergic, and other microbial infections. Certain STDs and other mucosal conditions can create red (or pink) eyes. Toxic reactions (soap within the eye, chlorine from the pool), not enough sleep, dry eye, etc. You can also bring a red eye from wearing contact lenses too long and depriving your eyes of oxygen...smoking, etc. As you can see, the list really go on...Good Luck!
barfing? lack of sleep?
Smoking huge amounts of apposite ganja.
drinking heavily or smoking pot or lack of sleep --or some types of eye diseases