A type of polyp on the vocal cords that prohibits good singing. When vocal cords get irritated (from fatigue, poor technique, an infection, etc.), they swell. Singing repeatedly with swollen vocal cords causes nodes. The only way to know if you have or are developing nodes is to go to a throat specialist (ENT). If you have frequent hoarseness or a constant sore throat, see one immediately. Treatment is usually rest, although surgery may be required in severe cases.