FNA refers to fine needle aspiration, which is a clinical test used to check whether there is any deformation or mutation of human cells, and this technique is often used to check thyroid cells. Relevant staff use fine needles to go deep into the thyroid tissue to extract thyroid-related cells, and then the cells are stained to make cell pictures, and then placed under the microscope to observe and check the state of the cells, which also belongs to a kind of pathologic puncture laboratory examination. This test is a pathologic puncture test that can be used to check the growth of the extracted cells and to determine whether an individual has thyroid cancer. However, because of the limitations of the extracted cells, it is easy to cause misdiagnosis and misdiagnosis, and if necessary, after the FNA test, chemotherapy and biologics are needed to limit the growth and development of the cancer in the body.