Depends on the type of the "scream". Guinea pigs use sounds as a primary means of communication.
Common type of guinea pig sound is called wheeking(called also squealing, or whistling): it means anticipationand excitement, particularly about being fed, or in response to the presence of its owner.
Please check the guinea pig sounds page of the Guinea Pig Manual (in provided link) where you can identify the type of sound you are referring to.
This can mean that the guinea pig was frightened from something loud, like a dog bark or telephone ring.
Loud ones. I really want a guinea pig! I hope I get one!
That is what guinea pigs do if they want attention.
This means a guinea pig is experiencing pleasure, enjoyment, or excitement. You will hear this noise when you pet your guinea pig or feeding it a treat. If you hear this noise suddenly when you are not petting your guinea pig it is afraid or it feels threatened. They purr if they hear a loud noise: a telephone ring or a knock on the door.
i believe it does that when its hungry or when it wants you around it so its secure because whenever my guinea oig does that i either feed it or cuddle it
It means the guinea pig feels happy.
Does cloudy eyes mean that the guinea pig is sick?
By bad guinea pig do you mean it bites? A guinea pig will only bite if it feels threatened, scared or hurt.
it's horny.
I think
Don't make loud noises? Or you could put him/her in the basement or somewhere quiet.
you mean girl guinea pig? Right?!? Because if not, at LEAST two weeks.