Thyroid cysts are generally benign lesions without significant clinical symptoms. When the cysts are larger, they may cause local compressive symptoms but generally do not develop into cancer.

Thyroid nodules can be benign or malignant; primarily, an assessment of the nodule is conducted to determine its nature. If the nodule is nonfunctional and benign, the condition is usually minor. If the nodule is functional, such as a hyperfunctioning adenoma, it can have a more significant impact on the body. If ultrasound evaluation of the nodule leans towards malignancy, the severity of the nodule is considered greater, and surgical treatment is needed.