Thyroid nodule 0.4*0.4cm malignant, usually take the way of surgical resection for treatment, it is recommended to consult a doctor. Malignant thyroid nodules 0.4*0.4cm are usually characterized by irregular margins and unclear borders, and may be accompanied by enlarged lymph nodes in the neck, and choking if the enlarged nodule compresses the recurrent laryngeal nerve. Surgical resection is a more effective treatment method, through which the lymph nodes around the gland are cleared, and depending on the degree of metastasis, the thyroid gland is completely or subtotally resected to maximize the removal of the lesion. After the surgery, you should keep a happy mood, pay attention to more rest, pay attention to a low iodine diet, try not to consume seafood, including kelp, nori, etc., and develop a healthy lifestyle. Meanwhile, go to the hospital for regular rechecks to prevent recurrence. If the patient’s examination shows that the thyroid nodule is 0.4*0.4cm malignant, he should go to the hospital in time to identify the cause of the disease and actively cooperate with the doctor for treatment.