Air from your lungs is forced through the vocal folds during exhalation forcing the folds to vibrate. This vibration creates that sound that ultimately becomes your voice once it is filtered through your oral cavity. Vocal folds are typically supposed to vibrate as a smooth, mucosal wave. However, yelling causes the folds to slam together. After repeated instances of the vocal folds slamming together, the folds become irritated and nodules may develop.
Nodules are benign growths on the vocal folds that usually result from vocal abuse or misuse.
Nodules are usually treated with voice therapy from a Speech-Language Pathologist. Cheerleading requires a greater amount of breath support than regular speaking. Inhale deeply to force air into the bottom of your lungs. Cheer only on exhaled air and not on inhalation. Avoid using your neck and shoulders for breathing.