Whether a thyroid nodule is dangerous or not needs to be determined by the doctor taking into account the nature, size and location of the nodule, and cannot be generalized. For example, malignant thyroid nodules are generally more dangerous, and some benign thyroid nodules may also be more dangerous. 1. Malignant thyroid nodules, especially low-differentiated and medullary thyroid cancer, are prone to lymph node and blood line metastasis, which may have a greater impact on the patient and may even affect his/her life, so timely surgical resection is needed and the lymph nodes in the neck need to be cleared. 2. Some benign thyroid nodules may become malignant, especially those with grade 4 or above on ultrasound, multiple thyroid nodules may become malignant, and thyroid nodules combined with hemorrhage may compress the trachea, leading to respiratory difficulties, and these cases need timely surgical treatment. Thyroid nodules should be diagnosed and treated in a timely manner to avoid delaying the condition.