Hashimoto’s thyroiditis is an autoimmune disease with a very limited impact on life expectancy, which does not differ much from the normal population, i.e. around 70-80 years. The main periods are as follows: 1. hyperthyroidism: the thyroid gland is attacked by autoimmunity and thyroid hormone levels rise briefly, this phase lasts for a short period of time; 2. stabilization: the thyroid function is basically normal at this time and does not require much intervention; 3. hypothyroidism: the thyroid gland suffers from autoimmune damage, resulting in low thyroid function, at this time it is necessary to supplement thyroid hormones as appropriate according to the level of thyroid function to bring it to normal In this case, thyroid hormones should be supplemented according to the level of thyroid function to bring it to normal. If thyroid function can be maintained to normal levels, Hashimoto’s thyroiditis has no effect on life expectancy.