Nodules grow like calluses on the vocal folds following vocally abusive behaviors. Nodules can cause hoarseness, breathiness, loss of range and vocal fatigue. Nodules are almost always treated without surgical intervention. Voice therapy is the most common form of treatment and is effective in most patients. Correct diagnosis is essential as nodules are often mistaken for other kinds of lesions on the vocal cords, but treatment is different depending on the condition.