Allergic rhinitis is conventionally treated with anti-histamine or immunotherapy, although in many cases the results are unsatisfactory. Using a contact type Nd:YAG laser we have succeeded in relieving the symptoms of rhinitis by thermocoagulating only the inferior turbinate, making this a quick and effective form of treatment. The subjects were 60 patients with severe house-dust induced allergic rhinitis presented to the out-patient clinic of the ENT department of Nagoya City University Hospital. There were 25 men and 35 women ranging in age from 17 to 53 years. Patients were irradiated at an output of 10 W for 0.5 s for a total of about 386 joules for both nasal cavities. Prior to the procedure, surface anesthesia was applied using 10% cocaine. The irradiation was completed in only one out-patients session. The effects of this therapy were evaluated using 4 points to express the degree of subjective symptoms and intranasal findings. From one week before surgery the patient was asked to record symptoms (sneezing, blowing, blockage) every day, and to continue this recording until 4 weeks after surgery. After surgery no drugs were used. The effects were evaluated by adding up the total scores for sneezing, blowing, and blockage at one week intervals, and comparing the total scores between one week pre-operatively and those 1, 2, 3, and 4 weeks post-operatively. Full effect, including disappearance of symptoms, was obtained in 80%, good effect in 10%, fair effect in 5%, and no effect in 5%.