Thyroid cysts refer to fluid-filled sacs found in the thyroid, generally round in shape and varying in size, with no significant clinical symptoms. They can appear as a single nodule or multiple nodules. Typically, when thyroid cysts are detected, high-resolution thyroid ultrasonography can be used to observe their ultrasonographic appearance. Thyroid cysts are generally considered benign thyroid nodules and usually do not require treatment. Regular follow-up with thyroid ultrasound is sufficient. If the thyroid cyst is too large and causes compressive symptoms, such as difficulty in breathing or swallowing, hoarseness, etc., surgical removal can be considered.