Patients with thyroid cysts can generally drink soy milk. First, let's understand what a thyroid cyst is. A thyroid cyst is a fluid-containing sac found in the thyroid gland. The lump is usually round, with a diameter of 2-5 cm, smooth, and generally painless or slightly painful. Most are solitary nodules, with multiple nodules being rare. Thyroid cysts usually do not display symptoms unless the cyst is large or there is some bleeding inside the cyst, which may cause symptoms of compression such as pain, difficulty swallowing, difficulty breathing, and hoarseness. Therefore, for thyroid cysts, if malignant, surgical removal is required; if benign, they are typically observed with follow-up. Thus, patients with thyroid cysts can drink soy milk.