Some say: "Well, you don't really use your vocal cords when you scream; you use your false cords, so if you're hurting your true cords, you shouldn't even be using them."
There's the legendary story of Corey Taylor who had perhaps the most ferocious scream in metal. It's even got it's own name: the Iowa Scream!
Iowa was Slipknot's first album and many maintain that Corey's screams were never as brutal after the Iowa album because he had sustained damage to his true folds.
Now think about that: Corey Taylor essentially invented his own technique for the Iowa scream and then he screws up on HIS OWN TECHNIQUE TO WHERE HIS VOICE IS NEVER THE SAME AGAIN!
You'd think a guy would be a master of his very own technique.
You'd LIKE to think so, wouldn't you?
Then there's the case of M. Shadows who screwed his voice up terribly and there is some confusion as to whether he actually had surgery for it or not.
There's also the case of Matt Heafy, who had a great sounding scream, did it well for quite a ferw years, but then blew out his voice. He went on to record an album of all clean singing because he was recuperating. Finally he came back with his "safe scream",. but Trivium fans maintain that the "safe scream" Matt Heafy used never sounded as good as his original scream which begs the question: Was his original scream fixable? With some minor tweaks, could he have kept doing his "original scream"? After all, it's hard to believe that his "original scream" was so dangerous that it had to be ENTIRELY CHANGED to make is SAFE!
So, with that in mind (especially the Corey Taylor incident with his Iowa scream being something he could never truly do as well again) what do you think are the main things that screamers do that end up injuring their voices?