During the 7 years period from March 1987 to Febrary 1994, 344 patients with thyroid nodules, were admitted and operated at Department of Surgery, Collage of Medicine, Hallym university. We obtained following results: 1) The thyroid nodules were prevalent in female with ratio 1:17.1, both benign and malignant nodules were prevalent in the forth decade(37.8%:25.8%). 2) The duration of illness within 6 months was most common: 47.1% and within 1 years was 66.6%. 3) The most prominent symptoms & sign were palpable mass in anterior neck(96.8%). 4) The right-sided thyroid nodules were most common. 5) Thyroid scaning and thyroid function test were found to be not much value in differentiating malignancy. 6) Accuracy of the fine needle aspiration cytology was 75.5%. 7) There were 251 cases(73.0%) of benign and 93 cases(27.0%) of malignant nodules: most frequent benign nodule was adenomatous goiter(67.7%) and the most frequent malignant nodule was papillary adenocarcinoma (86.0%). 8) The most commonly performed surgical procedure was unilateral lobectomy with isthmectomy in both benign(41.0%) and malignant(33.3%). 9) Postoperative complications are as follows: transient hypothyroidism 22cases, transient hoaseness 16 cases, hypothyroidism 6 cases, wound infection 4 cases, hematoma 3 cases, permanent hoaseness 2 cases.