The difference between thyroid enlargement and thyroid nodules

Written by Chen Xie

Endocrinology

Updated on December 07, 2024

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Thyroid enlargement generally refers to simple thyroid enlargement, which is typically diffuse thyroid enlargement, mainly caused by iodine deficiency, commonly seen in endemic goiter and physiological thyroid enlargement. Thyroid nodules, on the other hand, are nodular hyperplasia of the thyroid caused by certain physical and chemical factors. Thyroid nodules can manifest as benign hyperplasia or malignant hyperplasia. Therefore, the risks associated with thyroid nodules are relatively greater than those of thyroid enlargement. However, some patients with thyroid enlargement, as the disease progresses, can develop nodular hyperplasia of the thyroid. These are the differences between the two.

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Are thyroid nodules serious?

The severity of thyroid nodules needs to be assessed based on their nature, size, function, and location. Generally, they can be classified into benign and malignant, with malignant nodules being thyroid cancer, which requires timely treatment. Surgical treatment is the main method for treating thyroid cancer, whereas most benign nodules do not require special handling. Regarding the size of the thyroid nodules, if the nodules are too large and compress surrounding tissues such as the trachea, esophagus, and nerves, surgical treatment is recommended. For common benign nodules, regular observation is sufficient. Functionally, some thyroid nodules may affect thyroid function, such as in Hashimoto's thyroiditis, which can present with diffuse multiple nodules, leading to either hyperthyroidism or hypothyroidism. In such cases, appropriate medication treatment is needed. From a positional perspective, ectopic growth of thyroid nodules, if located at areas like the base of the ear, pharynx, neck, esophagus, or thoracic cavity, is a rare congenital developmental anomaly. If such a nodule significantly enlarges and compresses surrounding tissues, surgical treatment is advised.

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"Malignant thyroid nodules" means what?

Thyroid nodules are assessed under ultrasound with a grading system, and if rated at level three or higher, they tend to be more likely to be malignant. The most common malignancy in thyroid nodules is thyroid cancer. Among all types of tumors, thyroid cancer tends to grow slowly and is relatively less malignant. Therefore, if an ultrasound suggests a high likelihood of malignancy in a thyroid nodule, further examinations should be conducted. This can include a fine needle aspiration biopsy, thyroid contrast-enhanced ultrasound, or even direct surgical removal of the malignant nodule for further pathological examination to determine whether it is benign or malignant. Since the degree of malignancy of thyroid nodules is relatively low compared to other malignant tumors, a high grading score on a thyroid nodule should not be overly worrying. It is advisable to proceed with formal medical checks and regular follow-ups, as the five-year survival rate is quite high, exceeding 80%.

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Post-thyroidectomy complications

In clinical practice, for large thyroid nodules that cause compressive symptoms, such as difficulty swallowing, breathlessness, and hoarseness, thyroid nodule excision surgery can be performed. However, this surgery can have sequelae. First, if the excised thyroid tissue is too large, it can easily lead to reduced thyroid function, requiring lifelong supplementation with thyroid hormones for treatment. Secondly, due to the sensitive location of the thyroid gland, which is surrounded by various glands and nerves, injury during surgery can lead to complications such as seizures and hoarseness, which are considered post-surgical sequelae.

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Do thyroid nodules require surgery?

Whether thyroid nodules require treatment generally depends on medical guidelines. Thyroid nodules larger than 1cm with malignant features typically require biopsy. The decision for a biopsy should be made by a professional ultrasonographer after examination. Therefore, upon detecting a nodule, it is crucial to visit a specialized hospital for further ultrasound examination. If the nodule is malignant, we recommend surgical removal. If it is benign, close observation is advisable. However, treatment is necessary under the following conditions: First, if the nodule is too large and compresses other organs, causing breathing difficulties, localized swelling, pain, or other discomforts. Second, if the nodule grows quickly, increasing in volume by more than 50% within six months, the possibility of malignancy should be considered and treatment is needed. Third, if the thyroid nodule is located behind the sternum, which is called an ectopic thyroid nodule, surgical treatment is necessary. If the thyroid nodule is large enough to affect the aesthetics of the neck, surgical treatment may also be considered.

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Thyroid nodule surgery risks

The hazards of thyroid surgery actually refer to the risks involved in thyroid surgery. Thyroid surgery is now a common treatment method. The main risks of thyroid surgery include anesthesia on one hand, and postoperative bleeding on the other. There might be a need for a second incision for decompression. The most common complications are choking while drinking water and hoarseness of voice, mainly due to the involvement or damage to relevant nerves during the surgery. Generally, these complications resolve after a period of adjustment, and most people can recover normally.