Cool nodules are mostly seen in undifferentiated thyroid cancer, medullary carcinoma, cystic changes of the thyroid and the acute stage of subacute thyroiditis. Experts point out that cold nodules are a clinical symptom that is very harmful to the patient’s body, so patients need to go to a regular professional hospital for examination and treatment as soon as possible, in order to understand the condition more accurately and find the most suitable treatment method for the patient as soon as possible. At the same time, the general public should also do a good job of disease prevention, timely correction of bad habits. 1, good habits to develop good habits, do not smoke. 2, a good state of mind For patients to maintain a good state of mind, but also a stable emotions, the main own diet should be reasonable, eat more green fruits and vegetables, timely early their immune system. 3.Protect your respiratory system People who must work at heavy fumes, try to protect themselves, such as wearing a mask, going out regularly to get some fresh air, and having at least one check-up every year. 4.Stay away from smoke and dust Stay away from smoke, alcohol, drugs, radiation, pesticides, noise, volatile and harmful gases, toxic and harmful heavy metals, etc.