The study will take place at Montreal children's hospital. After the patients or parents of the patients agree for their children to take part in the study and sign a consent/assent form, baseline information will be collected and the patients will asked to fill out three questionnaires for GERD symptoms and nasal symptom. After that eligible patients will undergo sinus x-ray, nasal endoscopy and allergy skin test (these test are routine performed for all patients with symptoms of nasal obstruction). Then the patients will further be sub-divided into two groups based on the allergic skin prick test (SPT); allergy positive and allergy negative group. In each group patients will randomly allocated to one of the two study arms; group A will receive lansoprazole (prevacid) and mometasone furonate (nasonex) and the other group will receive nasonex and placebo. The lansoprazole/placebo will be discontinued after 3 months and the patients will undergo nasal endoscopy and will be asked to fill out the three questionnaires again to assess the improvement. The patients will be follow for another 3 months, the patients will again undergo nasal endoscopy and will asked to fill out the three questionnaires to assess the improvement and sustainability.