Thyroid nodules category 3 and 4 are graded under thyroid ultrasound. How long a thyroid nodule category 3 develops into a category 4 is affected by the patient’s physical condition, the degree of progression of the disease, and the effectiveness of the treatment, etc., and there is no clear time definition. 1. Faster progression: If a patient with category 3 thyroid nodules is in poor physical condition, the condition develops faster, the nodules themselves are malignant, and they are not treated in a timely manner, then they may progress to category 4 in a short period of time. 2. slower progress: if the thyroid nodule category 3 patients usually better health, slower development of the disease, the nodule itself does not belong to the malignant, the nodule for the benign lesions, the progression of category 4 time is longer, and even some patients will shrink the nodule will not be progressed to category 4. If diagnosed with thyroid nodules, standardized treatment should be carried out under the guidance of a doctor.