Common malignant signs of thyroid lesions include hoarseness, difficulty in swallowing, goiter, etc. 1. Hoarseness: once the malignant tumor of thyroid gland is formed, due to the development of local malignant tumors will cause compression of the recurrent laryngeal nerve, and after compression, paralysis of the vocal cord will occur. The main characteristic of many patients is hoarseness, at this time the throat will feel uncomfortable. 2. Thyroid enlargement: once the malignant tumor of thyroid appears, the main feature after the effect is the thyroid enlargement, which is the manifestation of the increase in the volume of local malignant tumor. 3. Difficulty in swallowing: it may be a signal of a serious disease, such as common esophageal cancer and thyroid cancer. During the pathogenesis of these diseases, the volume of local tumor increases gradually, and under the influence of compression, the swallowing process will become difficult. Whether a thyroid lesion is malignant or not cannot rely on the above symptoms alone, and most patients with thyroid cancer have atypical manifestations. Therefore, whether the thyroid lesion is a lesion or not requires further histopathological examination and active treatment under the guidance of a doctor.