Benign thyroid nodules may transform into malignant ones. Thyroid nodules are lumps within the thyroid gland and are a relatively common clinical condition caused by a variety of etiologic factors, such as iodine deficiency, the use of goiter-causing substances, the presence of cysts or inflammatory nodules, heredity, and autoimmunity can all cause thyroid nodules. When a thyroid nodule is found, it is important to determine its nature, which includes benign and malignant. Benign thyroid nodules may turn malignant, mostly related to long-term stress and dietary habits. Patients with benign thyroid nodules should have an ultrasound done every six months to observe whether there are any changes in the nodules, and if there are any changes in the nodules, they should consult a doctor as soon as possible. Patients with thyroid nodules should avoid strenuous exercise and heavy labor in daily life, pay attention to healthy diet, and recommend regular checkups to avoid delaying the condition.