In recent years, due to socio-economic development and changing attitudes, people have paid more attention to their health issues and health checkups have come into being, but with that, some problems have arisen. If a medical checkup does not reveal any problems, of course, you are happy. If a problem is found and you don’t understand it, misunderstandings will follow, and ultrasound findings of thyroid nodules or lesions are the most common cases. Ultrasound is a very sensitive examination instrument and the thyroid is a very superficial organ, so the probability of finding a thyroid nodule by ultrasound is very high, even a small nodule of a few millimeters with no symptoms may be found. In fact, the nodules described by ultrasound are merely a morphological description of the lesion, which is a general term for a variety of diseases including nodular goiter, tumors, and inflammation. As for the blood supply, an abundant blood supply also does not indicate that the lesion is malignant. A cystic change is the result of a ruptured blood vessel within a mass (such as an adenoma) or nodule that bleeds. In the case of a nodular goiter, it may be the result of cystic degeneration of the thyroid follicles containing colloid bodies that fuse with each other. Most cystic masses are benign, and only a small percentage may be malignant. As for multiple lesions, especially those with multiple small nodules combined with cystic lesions, many are nodular goiters, which are so common that Beijing has included nodular goiters in the medical insurance coverage for single lesions. What should you do if a thyroid nodule or lesion is found on ultrasound? First, you should go to a general or specialized hospital. If there is a thyroid specialist or a specialized clinic, you can register for a consultation. In some hospitals (including large hospitals), thyroid disease is seen in general surgery, so you can also register for general surgery. Next, you should do the necessary tests, including ultrasound, CT, thyroid scan, thyroid function tests, etc., as arranged by your doctor. After you get the test report, you should go to the doctor again to analyze the possible diagnosis and never think that having the test is seeing a doctor. Ancillary tests are not the same as seeing a doctor. Clinicians are different from ancillary department doctors in that clinicians will take medical history, check the body, and even understand the patient’s family and the patient’s psychological situation, etc., and then make a correct diagnosis through comprehensive analysis based on the information obtained. It is important to know that not all thyroid nodules or masses require surgery. Some small nodules, especially multiple nodules, may be nodular goiter, and nodular goiter without complications does not require surgery, and if surgery is done, the recurrence rate is high. If it is a solitary nodule with a solid nodule on ultrasound and a cold or cool nodule on thyroid scan, it is a high priority. If the ultrasound is a cystic mass and the thyroid scan is a cold or cool nodule, most can only indicate that the mass is cystic and that there is no tracer uptake in that area. If the examination reveals calcification, there are two conditions to differentiate between calcification of a nodular goiter and calcification of a possible malignant tumor, each of which has its own characteristics. Calcification in malignant tumors of the thyroid gland can be as high as 50% or more, mostly sand-like calcification, unlike calcification in nodular goiter. The best way to diagnose a disease is not to rely solely on one or two auxiliary tests. Therefore, the best way to find a thyroid nodule or lesion is to go to the hospital and have a doctor take a look at it and let him or her give you advice, which is the easiest and safest way.