The incidence of differentiated thyroid cancer increases with age and is common between 30-60 years old. The incidence of differentiated thyroid cancer increases with age and is common at the age of 30-60. Thyroid function tests are mostly normal in patients with differentiated thyroid cancer, but if it is transformed from other diseases such as hyperthyroidism or Hashimoto’s thyroiditis, there are corresponding thyroid function abnormalities. Medullary thyroid carcinoma is a malignant tumor that occurs in the parathyroid cells (C cells) of the thyroid gland. Medullary thyroid cancer accounts for about 4% of thyroid cancer, of which 75% are disseminated cases and 25% are hereditary diseases in families. Patients with medullary carcinoma may show symptoms of carcinoid syndrome such as flushing, palpitation, diarrhea and emaciation, but they are mostly not obvious under normal liver function, and are easily seen in patients with extensive intrahepatic metastases. Undifferentiated thyroid cancer is a rare and highly malignant tumor, the incidence rate of which does not exceed 5% of thyroid cancer, but the death rate accounts for 50% of thyroid cancer, and is mostly seen in elderly patients, generally over 65 years old. The majority of patients present with a sudden onset of neck lump, which is hard, uneven, poorly defined and rapidly increasing in size. It may be accompanied by hoarseness, difficulty in breathing and swallowing, and localized enlargement of lymph nodes. I believe that patients have a better understanding of this disease. I hope we can take it seriously, because this disease brings more troubles to patients and endangers the health of patients.