Precautions for thyroid examination are as follows: First, you should maintain a normal or light diet for three days before thyroid examination, avoiding spicy and greasy stimulating foods to avoid affecting the results of thyroid examination, and you should avoid foods containing too much iodine to avoid thyroid enlargement. Second, try to avoid taking drugs that affect the abnormal secretion of thyroid hormones such as reserpine. Clinically, some drugs can cause abnormal secretion of thyroid hormones, which should be explained to the doctor during the examination. Avoid excessive emotional tension and maintain a calm and relaxed mood for thyroid examination. Excessive emotional tension can affect the instability of thyroid hormone secretion, which will have an impact on the examination results.