The thyroid gland is the largest and most important endocrine gland in the human body. It is located in the middle of the neck and consists of two lateral lobes and a narrow isthmus lobe in the middle, like a butterfly spreading its wings and flying. It is an important organ for human growth, development and energy metabolism. Thyriod carcinoma (thyroid cancer), referred to as “nail cancer”. In recent years, the incidence of thyroid cancer has been increasing rapidly year by year not only in China but also in the world, and the incidence rate is increasing at 6.2% per year, especially among women. The incidence of thyroid cancer has become the first and most common malignant tumor among women in Korea and Zhejiang Province of China. Therefore, thyroid cancer has gradually entered the ranks of common malignant tumors and has been attracting more and more attention from the general public. Due to the limitations of knowledge and professionalism, there are still some misconceptions about thyroid cancer and some hot topics to be solved. Under normal circumstances, it is not easy for us to feel the outline of thyroid gland in the neck. When we see or feel the swelling or lump in the neck, we need to be alert to the possibility of thyroid disease. At this time, it is recommended that you visit a specialist hospital for an ultrasound examination of the neck, which is a simple, non-invasive test that can initially clarify the nature of the disease.