Effect of Low Level Laser Therapy in Patients With Chronic Rhinosinusitis.

Inclusion Criteria: * patients suffering from mild to moderate symptoms. Exclusion Criteria: * Pregnant or breastfeeding women * Patients with a definite deviated nasal septum, sinusitis, or history of operation within the last 6 months. * Patients with hypertension, diabetes mellitus, malignancy, active pulmonary tuberculosis, infection, active respiratory disease like asthma, or other systemic diseases; • patients with long-term use of corticosteroids or immunosuppressive agents. * Patients with hypersensitivity to the laser. * Patients who were involved in another clinical study within 30 days. * Patients who were unable to comply with the follow-up schedules. * patients who had used antihistamines within 1 week, topical corticosteroids within2 weeks, systemic corticosteroids within 4 weeks, anti-cholinergic drugs within 3 days, antileukotriene drugs within 1 week, decongestants within 3 days, tricyclic antidepressants or phenothiazines within 2 weeks, non-steroidal analgesics within 2 weeks, and other drugs whi