Thyroid calcification with ultrasound grading suggesting category 4b is not necessarily cancerous, but it is more likely to be cancerous. Thyroid nodules are classified into 6 categories according to the ultrasound grading method, of which categories 1, 2 and 3 are more likely to be benign, and categories 4, 5 and 6 are more likely to be malignant. category 4 is further divided into 4a, 4b and 4c. Category 4a is low suspected malignant nodule, the chance of cancer is about 2%~10%; category 4b is medium suspected malignant thyroid nodule, the chance of cancer is about 10%~50%; category 4c is highly suspected malignant thyroid nodule, the chance of cancer is 50%~90%. Therefore, calcified thyroid nodule category 4b is not necessarily cancer, but the chance of cancer is higher. If a thyroid nodule calcification category 4b is particularly small, less than 1 centimeter, patients are usually advised to follow up regularly. If the thyroid nodule calcification category 4b grows faster and is already more than 1 centimeter, patients are generally advised to have a puncture pathology examination guided by ultrasound, and then consider whether surgery is needed if necessary. If you feel unwell, you should go to the hospital machine in time, so as not to delay the condition or cause adverse reactions.