Thyroid symptoms are mostly caused by thyroid diseases, such as: hyperthyroidism, hypothyroidism, thyroid nodules, thyroid tumors and so on. Hyperthyroidism is hyperthyroidism, which is a very common endocrine disease. Patients with hyperthyroidism have excessive secretion of thyroid hormone synthesis, which leads to the whole body being in a state of thyroid hormone hyperactivity. Clinical manifestations include fear of heat, excessive sweating, hyperphagia, increased frequency of bowel movements, palpitations, and so on. Hypothyroidism is hypothyroidism, which is a systemic disease caused by insufficient secretion of thyroid hormone, with clinical manifestations such as fatigue, chills, weight gain, bradycardia, constipation, and so on. Thyroid nodules are extremely common in the clinic. Insufficient or excessive iodine intake can cause thyroid nodules, the vast majority of which are benign and a few are malignant. Most of the nodules are benign and a few are malignant. Most of the nodules do not have any clinical symptoms and are often found during physical examination. Some thyroid nodules can lead to hyperthyroidism. It is recommended that patients with thyroid symptoms actively seek medical attention and standardized treatment under the guidance of a doctor.