Thyroid 4a is the classification of thyroid nodules. Generally, category 4a is not self-healing and requires conservative or surgical treatment after diagnosis of the condition. The etiology and pathogenesis of thyroid nodules remain unknown. Benign thyroid nodules include multinodular goiter, Hashimoto’s thyroiditis, cysts, and follicular adenomas. The vast majority of malignant nodules are thyroid carcinoma, and a few are primary thyroid lymphoma or metastatic thyroid carcinoma, which usually do not heal on their own. In ultrasound examination of the thyroid gland, thyroid nodules are categorized into 6 grades, and the higher the grade, the higher the risk of thyroid cancer. Thyroid nodules graded at grade 3 or below have a higher probability of being benign nodules, grade 4 or above may be malignant, and grade 6 can be determined to be malignant. Thyroid nodule grade 4a, if there are signs of malignancy, it is recommended to carry out thyroid nodule puncture pathology as soon as possible, if suggests benign lesions, according to the patient’s wishes to choose conservative treatment or surgical treatment as soon as possible. If malignant lesions are indicated, surgery is necessary as soon as possible, after which radiotherapy and medication can be chosen according to the specific situation. If you find thyroid nodules, it is recommended that you consult a doctor promptly.