A small amount can potentially carry diseases (Hepatitis, HIV, etc.) If it is your own blood, you're fine. Depending on the person, a cup or so of blood in your stomach can give you a stomach ache and possibly nausea.
spit
The answer would be no. If the person spit blood into your mouth and you had a sore then YES. Spit will not give you HIV.
If there was blood in the mouth, they would probably spit it out if they didn't want it. They wouldn't do so for any other reason in common legend.
It actually comes out the spit valve located on the pipe under the bell
tuberculoses and lung rupture make you cough blood, but pretty much anything that causes you to bleed inside your mouth can cause you to spit blood.
spit
It means saliva/spit is building in your mouth while your asleep and slowly comes out.
really, the base player gene simians, is the only one that spits blood, and he has a packet of red liquid in his mouth that he bites, and when it pops in his mouth, it appears that he's spitting blood.
they have to touch your spit and all up in your mouth. I know its good but it creeps me out when there in my mouth. Then they have to deal with blood too. I could never do that.
No, they just are parasitistic as they suck your blood. They leave bumbs because they injected a toxin to stop blood clotting and keep the blood flowing. Some people may be allergic to them, but I doubt there are tons of people that are.
HIV infection possible if that person has HIV and the blood/spit gets into your blood stream through the eyes, mouth or nose. (Or open cuts)
study show that pee is cleaner than spit in your mouth .