Thyroid grade 3 usually refers to thyroid nodule grade 3. Whether it will become serious or not should be analyzed according to the patient’s personal constitution and comprehensive situation. When thyroid nodule grade 3 is detected, it is necessary to have regular review and follow-up observation. Clinically, when thyroid nodules are detected by ultrasound, they are classified into grades 1-6, of which grade 3 suggests a high probability of benign lesions and less than 2% probability of malignancy. However, for grade 3 thyroid nodules, regular checkups are still needed to observe the size and shape of the nodule, and if the nodule grows too fast, the possibility of malignant changes should be guarded against, and puncture biopsy should be taken when necessary to help diagnose the condition. If grade 3 thyroid nodules are found, you should follow up with your doctor regularly and review the thyroid ultrasound to prevent the condition of thyroid nodules from deteriorating, and if you have any discomfort, you should communicate with your doctor at any time for timely diagnosis and treatment to avoid delaying your condition.