Is a thyroid nodule classified as Level 3 serious?
Jul 07, 2025
Source: Cainiu Health
Dr. Yang Chuanjia
Introduction
In ultrasound assessments, grade 3 thyroid nodules typically appear well-defined with regular shapes, carrying a less than 5% risk of malignancy. If the nodule is small in diameter, such as less than 1 cm, and there are no symptoms of compression on surrounding tissues, such as a sensation of swallowing a foreign object or difficulty breathing, generally no specific treatment is required. Regular follow-up ultrasound examinations of the thyroid are sufficient. These types of nodules have minimal impact on health and usually do not warrant significant concern.
Generally, most thyroid nodules classified as category III are benign and not serious, but the specific situation should be considered for accurate assessment. If the nodule has a regular shape and shows no signs of malignancy, there is usually no need for excessive concern. However, if the nodule is large or shows signs of potential malignancy, it should be taken seriously. If abnormalities are detected, timely medical consultation is recommended. Detailed explanations are as follows:
Category III thyroid nodules typically appear with clear boundaries and regular morphology on ultrasound, with a risk of malignancy less than 5%. If the nodule is small, for example less than 1 cm in diameter, and does not cause symptoms such as pressure on surrounding tissues—like a sensation of foreign body during swallowing or difficulty breathing—special treatment is generally unnecessary. Regular follow-up ultrasound examinations of the thyroid are sufficient, as these nodules have minimal impact on health and do not require excessive worry.
If a category III thyroid nodule is relatively large—for instance, larger than 2 cm—it may compress surrounding structures such as the trachea or esophagus, causing discomfort during breathing or swallowing. If ultrasound reveals features such as blurred nodule margins, calcifications within the nodule, or abnormal blood flow signals, the possibility of malignancy should be considered. Further diagnostic evaluation with fine-needle aspiration cytology (FNAC) of the thyroid is required to determine the nature of the nodule. If malignancy is confirmed or suspected, timely treatment, such as surgery, is necessary.
After being diagnosed with a category III thyroid nodule, maintaining healthy lifestyle habits is important, including avoiding late nights and excessive anxiety. Dietary iodine intake should be adjusted according to thyroid function. Thyroid ultrasound and function should be reviewed every 3–6 months. If the nodule increases significantly in size over a short period or symptoms of compression occur, immediate medical attention is required.
