Background &Method: The aim of this study is to study the role of sonography in distinguishing benign from malignant thyroid lesions. Random selection of patient of all age groups was done. They presented with sign and symptoms suggestive of thyroid disorders. The commonest clinical symptom was swelling in front of neck, which moves up with deglutition. There were systemic symptoms like pain and fever in thyroiditis, weight loss and palpitation in hyperthyroidism, weight gain and hoarseness of voice in hypothyroidism and rapid increase in size with weight loss in malignancies.