The dangers of diffuse thyroid lesions include abnormal thyroid function and localized pressure symptoms. Some diffuse thyroid lesions can lead to abnormal thyroid function, when the body’s thyroid hormone secretion is too much, it can lead to multi-system excitability increase, metabolism increase. When affecting the cardiovascular system, heart rate increases, heart enlargement, heart failure, etc. Long-term effects can lead to hyperthyroidism heart disease. It can also cause lethargy, diarrhea, irritability, fear of heat, hyperphagia and other hazards. When diffuse thyroid lesions appear goiter, the enlarged thyroid gland can compress the surrounding tissues. When it compresses the trachea, it can lead to symptoms such as chest tightness, dyspnea, and wheezing. Compression of the recurrent laryngeal nerve can lead to hoarseness. The presence of diffuse thyroid lesions, it is recommended to seek timely medical treatment, under the guidance of a professional doctor, standardized treatment.