The prevention of thyroid nodules is as follows: 1. Thyroid nodules may be related to insufficient iodine intake, and the incidence of thyroid nodules is higher in areas with iodine deficiency. However, the more iodine you have, the better. In areas with high iodine content in diet or water, the incidence of thyroid nodules is also higher, so iodine supplementation should neither be too high nor too low. 4, pay attention to maintain optimism, positive emotions, to prevent depression, the incidence of thyroid nodules will be reduced, so to maintain an optimistic state of mind, is also vital to health.