In recent years, the diagnosis rate of thyroid nodules has increased year by year. In addition to factors related to the environment, diet, lifestyle habits, and mental stress, the development of screening technology has also increased the detection rate of the disease. High-resolution ultrasound plus thyroid function tests can lead to rapid clinical diagnosis of more than 95% of thyroid nodules. Studies have found that thyroid nodules are more prevalent in women. The prevalence ratio of women to men is about 3:1, which may be related to the difference in estrogen and progesterone in the body between men and women. In addition, there is also radiation exposure, family history of inheritance and different stress tolerance and psychological regulation in women related to the fact that the incidence of thyroid nodules is much higher in women than in men. In clinical practice, 95% of thyroid nodules are benign, and a functioning thyroid nodule has no significant health consequences. If the benign nodules are small and have no obvious pressure symptoms, they can be treated conservatively, but they should be reviewed regularly at the hospital. Usually, you should visit the hospital every six months for a thyroid ultrasound to see if the nodules have changed. If the ultrasound indicates that the thyroid nodules are irregular in shape, with unclear borders, multiple internal calcifications, longitudinal to transverse ratio greater than 1, rich internal blood flow signals, and rapid growth, this may indicate that the thyroid nodules are malignant, and it is recommended to consult the thyroid surgery, for example, to do a fine needle aspiration. The prevention of thyroid nodules in daily life is recommended to do the following: 1. Control of iodine intake can be controlled according to the actual local iodine nutrition level. The daily diet of people in highlands and mountainous areas often contains insufficient iodine and can be cooked with iodized table salt, while people in coastal areas should control excessive iodine intake. Not all thyroid disorders require avoidance of iodine. Low or excessive iodine intake can cause thyroid nodules. For patients with hyperthyroidism, a low iodine diet is indeed necessary. In the case of thyroid nodules, until the nature of the nodule is diagnosed pathologically, there is no need to deliberately avoid iodine, and the decision can be made based on the urinary iodine results and the recommended daily iodine intake. 2. Combine work with rest and physical exercise to strengthen your body and reduce the possibility of disease. 3. Keep away from pollution to prevent the occurrence of thyroid, to prevent environmental pollution, away from harmful chemicals, is important to prevent thyroid disease. The most crucial factor in preventing thyroid nodules is to have a happy mood, a relaxed living environment, and a positive and optimistic attitude towards life.