After 131I treatment for Graves’ hyperthyroidism, hypothyroidism (hypothyroidism) may occur, the mechanism of which is unclear. It can be divided into early-onset hypothyroidism and late-onset hypothyroidism. Early-onset hypothyroidism refers to the appearance of hypothyroidism within 1 year after 131I treatment, which may be mainly related to the patient’s thyroid gland being more sensitive to radiation and the dose of 131I treatment, etc. Some patients with early-onset hypothyroidism may recover on their own. There is no method to predict early onset hypothyroidism. Lowering the dose of 131I treatment can reduce the incidence of early-onset hypothyroidism, but the rate of primary cure is also reduced. Late onset hypothyroidism refers to hypothyroidism that occurs after 1 year of 131I treatment.
~It may be mainly related to the abnormal autoimmune function of the patient and not to the 131I dose. It is easy to diagnose and treat hypothyroidism clinically, but only those with long-term untreated hypothyroidism and progressive worsening of hypothyroidism will develop serious hypothyroid symptoms and complications. The key to dealing with hypothyroidism is early detection and timely replacement therapy with thyroid hormones, which will not bring harm to the body. On the contrary, timely correction of hyperthyroidism can also reduce complications caused by hyperthyroidism, such as hyperthyroid heart disease and hyperthyroid crisis.