At present, many thyroid patients are found to have calcified foci during ultrasonography, and when asked to operate, they are very nervous. The clinical significance of calcified thyroid foci is described below. Calcified foci are caused by calcium deposits in the thyroid nodules and can be divided into four most common types: microcalcifications, coarse calcifications, marginal calcifications and calcified spots. Microcalcifications are mostly calcifications and fibrosis secondary to amyloid deposits within the sarcoplasmic or medullary carcinoma, showing punctiform strong echogenicity, which are seen in 40% to 60% of papillary carcinoma patients. Coarse calcification, marginal calcification and calcified spots are usually caused by malnutrition and are signs of benign nodules, with coarse calcification and marginal calcification (meaning calcification located at the marginal areas of thyroid nodules) commonly seen in nodular goiter. Calcified spots are single foci of coarse calcification and are commonly seen in benign lesions such as nodular goiter and hyperthyroidism. Therefore, different types of calcified thyroid foci represent different clinical significance. Whenever you encounter a calcified foci, you mistake it for cancer and carry a heavy mental burden. The best option is to go to the hospital to see a doctor and then decide on a treatment plan. Personally, I think that for microcalcification foci, we should actively treat them surgically by performing a total thyroidectomy on the side of the foci, and then decide the next treatment plan according to the intraoperative freezing situation. For other types of calcified foci I personally believe that the decision should be made based on the specific condition and close follow-up is very important.