Thyroid nodule category 5 is an ultrasound classification, category 5 thyroid nodules are highly suggestive of malignant nodules, malignancy rate > 90%. Generally need to puncture biopsy to clarify the nature of the nodule, if the thyroid nodule category 5 is diagnosed as benign nodules, and the volume is small, you can follow the doctor’s instructions for regular follow-up observation, if the diagnosis of malignant nodules, the need for surgical treatment. If the nodule is >10mm, puncture is recommended; if the nodule is adjacent to the peritoneum, trachea, or laryngeal reentry nerve, or if it is a multifocal nodule, then puncture can be considered when it is >5mm. Smaller thyroid category 5 nodules need to be determined according to the nature of the nodule to determine whether treatment is required, and patients are advised to seek timely medical attention, actively communicate with specialists, and choose the appropriate treatment.