There is no exact time for how long it will take to get well from hyperthyroidism, the swelling often subsides within half a year in mild cases, and can reach more than half a year or even cannot be relieved in severe cases. The exact time is related to the severity of the patient’s condition, physical condition, and treatment effect. The thick neck of hyperthyroidism is caused by the enlarged thyroid gland. If the patient is younger, in good health, the symptoms of hyperthyroidism are not very serious, and the treatment is timely, within a short period of time to control the thyroid hormone within the normal range, the thick neck can often be improved within six months. If the patient is older, in poorer health, has a longer course of the disease, and treatment is not timely, it will often take more than half a year or even longer for the thick neck to improve. The treatment of hyperthyroidism mainly includes anti-thyroid medication, radioactive iodine, and surgery. Patients who have a thick neck that is intolerable, or who have severe pressure symptoms such as difficulty in breathing or swallowing, may be treated with surgery. If diagnosed with hyperthyroidism, attention should be paid and standardized treatment should be carried out under the guidance of doctors.