Hashimoto's thyroiditis is an autoimmune disease, which is neither hereditary nor contagious, but it does tend to run in families. If parents have Hashimoto's thyroiditis, their children are at a relatively higher risk of developing the disease. Therefore, Hashimoto's thyroiditis is not contagious, so everyone can be reassured. As for the treatment of Hashimoto's thyroiditis, if hypothyroidism occurs, one simply needs to take levothyroxine on time for replacement therapy to restore thyroid function to normal levels without any special discomfort. When the thyroid gland in Hashimoto's thyroiditis is relatively large and causes significant compression symptoms, surgical treatment can be considered. Therefore, Hashimoto's thyroiditis is not contagious, nor is it hereditary, but it does have a familial clustering tendency.