Malignant thyroid tumor and thyroid cancer are actually the same disease, just called by different names. Thyroid nodules are very common in clinical practice, but the percentage of thyroid nodules among thyroid malignant tumors is not high. If a thyroid nodule is found in the ultrasound examination of the thyroid gland, there is no need to panic too much, and not all nodules can be considered as malignant thyroid tumor or thyroid cancer. It is important to go to a regular hospital for further examination, including thyroid function, isotope scan and, if necessary, ultrasound-guided thyroid aspiration, which can help identify the nature of the nodule and determine whether it is a benign or malignant tumor of the thyroid. Malignant tumor is cancer, a disease with a very low cure rate. Although thyroid cancer is said to have a low cure rate, it is really the only cancer that does not affect life expectancy. Malignant tumors are called cancer mainly because cancer can metastasize, spread and multiply. Even after early treatment, recurrence can occur after treatment, and the recurrence rate is high within five years, and many cancer patients lose their lives when their cancer recurs. Early detection and early treatment embody a particularly important role.