Polyps can occur singly or in pairs. Usually, a polyp forms mid-way along the free margin of the vocal fold. Sometimes, a smaller lesion forms on the opposite vocal fold in reaction to the polyp, where the tissue gets irritated by the initial polyp hitting against it during each cycle of vibration. Unlike nodules which usually form slowly over time from repeated and prolonged irritation, a polyp can sometimes form as a result of an isolated traumatic occurrence, such as coughing violently or screaming at a sporting event.
Treatment for a polyp usually begins with voice therapy, often accompanied by voice rest, a significant (but temporary!) reduction in voice use. Sometimes, surgery is necessary in order to provide the patient with the best voice outcome.