Thyroid cysts refer to fluid-filled sac-like structures that occur in the thyroid gland. Typically, thyroid cysts do not exhibit any clinical symptoms. However, if they continue to grow, there is a risk of bleeding within the cyst. Therefore, when the cyst is larger than 3 centimeters, surgical treatment is often recommended. Generally, surgical removal is quite safe and reliable, and the prognosis after surgery is usually good with a low risk of recurrence. However, there is still a chance of recurrence, and if it recurs, surgery can be conducted again. Hence, thyroid cysts are relatively mild and benign lesions. If the cyst is smaller than 3 centimeters, alcohol sclerotherapy can also be performed.