These are benign, small swellings situated on the apposing surfaces of the true cords, commonly at the junction of the anterior one-third and posterior two-thirds. They may be symmetrical. The swellings are made of keratin and result from constant banging together of the vocal cords due to vocal overuse - as in singing, teaching - or abuse - poor speed production.

Speech therapy is usually effective. Larger nodules may require prior removal surgically.