Introduction: When conservative medical treatment options,such as antihistamines, topical decongestants, and topical corticosteroids, fail in inferior turbinate hypertrophy, reduction of the inferior turbinate can be performed using various surgical techniques. Objective: To Assess effect of using diode laser on symptomatic hypertrophied inferior turbinate and to compare between diode laser and diathermy. Methods: Interventional study (clinical trial).carried out in Otorhinolaryngology –Head and Neck surgery Department ORL-HNS department Zagazig University in the period from Jan 2018 till Feb 2019. On a total sample size of 55 11 in each group of Submucosal technique by diode laser, Linear technique by diode laser, Cross hatching technique by diode laser, Bipolar Diathermy and Monopolar diathermy groups.Also 10 medical staff volunteered as control for methylene blue colored saccharine test. Results: There was high significant difference as regard postoperative nasal obstruction and headache findings (most of submucosal technique by diode laser improved). There was significant difference between the studied groups in post operative complications as regard pain, crusting and synechia. Conclusion: Laser reduction seems to be standing out as methods that can be applied under local anesthesia providing minimal morbidity (very low risk of intra- and postoperative bleeding and other (complications) combined with high patients comfort (time-saving application, outpatient procedure, no nasal packing