Abstract: From routine physical examinations, thyroid cancer is the most common malignant tumor detected, especially thyroid microcarcinomas of less than <1 cm. Nevertheless, the discovery of these microcarcinomas has caused panic in many people. The questions are:How do the so many thyroid microcarcinomas be treated? Should surgery be performed or should they just be observes? According to experience on thyroid microcarcinomas,the majority of them grew slowly therefore observations of the tumors have been recommended. For some cases with unsatisfactory locations or with obvious lymph node metastasis, surgery is highly recommended.

Key words: thyroid gland, malignant tumor, microcarcinoma, operation, observation