Included: Subjects will be adults with nasal polyposis, recruited from the PI's private practice, will not be currently taking a PP!, will be able and willing to undergo a noninvasive 24 hour pH probe study, and willing to take a PPI. Excluded: patients who are pregnant, have a history of surgical treatment for reflux disease, history of allergic or adverse reaction to Prevacid or adverse reaction to Prevacid during the study period, and those not meeting inclusion criteria.