There is no question of “what does it mean when thyroid gland goes to the chest cavity”, thyroid gland does not go to the chest cavity; however, when thyroid cancer develops thoracic metastasis, the cancer cells can be transferred to the chest cavity, which suggests that the cancer cells have spread. Thyroid gland is an important endocrine organ, which is located in the lower part of the thyroid cartilage in the neck and both sides of the trachea, and consists of left and right lobes, conical lobes and isthmus, so there is no such saying as “what does it mean when thyroid gland goes to the chest cavity”, and the thyroid gland will not go to the chest cavity. However, in the advanced stage of thyroid cancer, metastasis may occur in the chest cavity, and the cancer cells may move to the chest cavity, followed by symptoms such as pleural effusion and pain, which suggests that the cancer cells have spread. It is recommended to go to the hospital when thyroid abnormalities occur.