Thyroid nodules in the early stages often show no clear symptoms, with only small nodules appearing within the body. The size of these nodules can range from several millimeters to several centimeters, and their texture is generally slightly harder compared to the surrounding glandular tissue. When the enlargement is more noticeable, the nodule can move up and down with the thyroid gland during swallowing. In addition to the presence of nodules, when the thyroid nodule is prominent, it can compress the trachea, leading to difficulty breathing and irritative dry cough. If it compresses the recurrent laryngeal nerve, it may cause hoarseness, varying degrees of hoarseness, and even an inability to speak loudly. In patients with malignant nodules, the invasive malignant cells can cause symptoms such as hoarseness, difficulty breathing, dysphagia (difficulty swallowing), diarrhea, palpitations, facial flushing, and decreased blood calcium levels. If these symptoms occur, it is crucial to seek medical attention promptly.