Most of the thyroid adenomas have no conscious symptoms, but are often unintentionally felt as a lump in the anterior neck area, or found during a physical examination. Most of them are single, with obvious sense of envelope and soft texture, and can move up and down with swallowing. 2. The tumor grows slowly, sometimes the tumor increases suddenly, accompanied by swelling and pain, which is mostly caused by intracapsular bleeding, but after a period of time, the blood in the tumor is absorbed, and the tumor can shrink or even disappear. A few enlarged tumors can compress the surrounding tissues and cause tracheal displacement, but rarely cause respiratory difficulty and rare symptoms of laryngeal nerve compression. However, it rarely causes dyspnea, and rarely causes laryngeal nerve compression. Posterior sternal thyroid tumor can cause dyspnea and superior vena cava compression due to compression of trachea and large blood vessels. 4. A few adenomas may become very hard due to calcified plaques. A typical thyroid tumor is easily diagnosed clinically, and functional tests are usually normal.